Engine losing power?

It sounds like the fuel pump is going out but be sure this guide can help us and I have included a video to show you how to the fuel pump can be replaced on a similar car.

https://youtu.be/SOmd3BoE4YU

and

https://www.2carpros.com/articles/engine-has-low-power-output

Please run down these guides and report back.

Nice work, we are here to help, please use 2CarPros anytime.

From the information that you have presented, it sounds like the transmission may be the problem. If the tach is running up correcponding to engine sound, and the car is not accelerating, it might indicate that the transmission is slipping.

I would start by scanning for codes. Not all transmission problems will light the MIL light. That is, the "check engine" or "service engine soon" light.

A/C compressors put a very small load on the engine but nothing like you describe. If the compressor started to drag to that extent, it would cause the belt to slip and make noise so I suspect your problem is somewhere other than the A/C. You can have gauges put on the A/C to see if there is any high pressure or anything that would indicate an A/C problem.

What was the code?
Check for a vacuum leak and intake gasket
also do a fuel pressure test

P0174? Only

1. HO2S sensors are not likely to be the cause of adaptive DTCs P0171, P0172, P0174, P0175: Most warranty-returned HO2S sensors (replaced for these DTCs) are found to function normally. Additional related DTCs will normally be present if there is a concern with the HO2S sensors. Do not replace an HO2S sensor unless verified through pinpoint diagnostic tests found in the PC/ED Service Manual.

2. DTCs P0171, P0172, P0174, and P0175 are not related to downstream HO2S sensors: When diagnosing a vehicle with a MIL On and DTC(s) P0171, P0172, P0174, and/or P0175 in continuous memory, do not replace the downstream HO2S sensors. These DTCs have no connection to the downstream HO2S sensor function nor its diagnosis for faults. Always verify the vehicle concern, then perform the pinpoint diagnostics from the appropriate PC/ED Service Manual.

3. Diagnosing lean conditions and lean DTCs P0171, P0174: Freeze Frame Data can often help to identify the type of lean condition, even if the fault is intermittent, by indicating how the vehicle was being driven when the fault occurred. Diagnosis of lean conditions and lean adaptive DTCs can be difficult, especially if the concern is intermittent. Verifying the concern is extremely important. There are different types of lean conditions. The ability to identify the type of lean condition causing the concern can be crucial to a correct diagnosis. When DTCs P0171 and P0174 are both present, there is a strong likelihood of another concern being present: a. Vacuum leaks/unmetered air: In this type of condition, the engine may actually run lean of stoichiometry (14.7:1 air/fuel ratio) if the PCM is not able to compensate enough to correct for the condition. This condition is typically caused by air entering the engine through an abnormal source (opening), or due to a MAF malfunction. In this situation, the volume of air entering the engine is actually greater than what the MAF is indicating to the PCM. Vacuum leaks will normally be most apparent when high manifold vacuum is present, during idle or light throttle. If Freeze Frame Data indicates that the fault occurred at idle, a check for vacuum leaks/unmetered air when the engine is cold might be the best starting point.

Examples: Loose, leaking or disconnected vacuum lines, intake manifold gaskets or O-rings, throttle body gaskets, brake booster, air inlet tube, stuck/frozen/aftermarket PCV valve, unseated engine oil dipstick, MAF reading lower than normal, etc.
B. Insufficient fueling: In this type of condition, the engine may actually run lean of stoichiometry (14.7:1 air/fuel ratio) if the PCM is not able to compensate enough to correct for the condition. This condition is typically caused by a fuel delivery system concern that restricts or limits the amount of fuel being delivered to the engine. This condition will normally be most apparent when the engine is under a heavy load, when a higher volume of fuel is required. If Freeze Frame Data indicates that the fault occurred under a heavy load, a check of the fuel delivery system (checking fuel pressure with engine under a load) might be the best starting point.
Examples: Low fuel pressure (fuel pump, fuel filter, fuel leaks, restricted fuel supply lines), fuel injector concerns, etc.
C. Exhaust system leaks: In this type of condition, the engine may actually be running near stoichiometry (14.7:1 air/fuel ratio), but the exhaust gas mixture will be lean. This condition is caused by oxygen-rich air entering the exhaust system through an external source. This condition will cause the exhaust gas mixture to be lean, even though the actual combustion in the engine may not be.
Examples: Exhaust system leaks upstream or near HO2S, malfunctioning Secondary Air Injection system.
D. MAF concerns

The trans could be going in and out of OD. Is the check engine light on? This could be an indicator of the PCM seeing a problem in the trans. Check the fluid level, and have it serviced if it hasnt been done, this may help. If the check engine light is on, have the PCM scanned for codes.

What is "loos of power"? Car won't go? Car stalls at stop? Car goes down the road and stalls at speed? What sensors were replaced? Were there codes to indicate these sensor issues?