My engine has no power why?

Runs starts and idles great just sluggish when ya press on gas no codes and no engine light changed tps fuel filter and air filter also tried the mass air flow sensor off my dads Tahoe all this with no change in issue sluggish off idle wont rev over 3000 rpm proper fuel pressure and exaust seems to flow proper and sounds normal tomorrow afte work I plan to pull the two pre cat o2 sensors to see if increase flow helps how it runs

Have a 99 Chevy Tahoe with 350 auto 4x4 starts and will idle fine but will not rev over 2500-3000 rpm starts to stumble no codes and no check engine light drives like a champ untill u need more than 1/4-1/2 throttle then falls on its face I installed new air filter and fuel filter please help !

Ok pulling out of work today it stumbled and had no power from idle all the way through the rpm range got home hooked up fuel pressure tester and reads 55-65 psi at all ranges of throttle then on my way to the store I jumped on it and ran like a champ tranny kicked down and took off and now sitting in park will rev past the 25-3000 mark no problem Could this issue be with a faulty tps sensor?

Ok I have a 1999 chevy Tahoe with 186000+ miles, I recently changed out the catalytic converter, and both upstream and downstream O2 sensors about a week ago. Just yesterday I did a major tune up replacing the Distibutor, rotor cap, oil change, plugs, wires, thermostat, egr, pcv and air filter. In hopes of getting my gas mileage up back where it was. Now the problem im having is after the catalytic converter was changed out my truck has been having these power problems when I turn on the heater or rear defrost my battery drops out pretty signifigantly. I told the mechanic about the problems I was having and he told me that the problems I speak of with the heater is normal, not to worry about it and he went ahead and did the tune up with the parts I got for the truck. Now a day latter my battery practically is completely drained but has enough power to keep the light in the cab and the lamps on the dash and headlights on, head lights are on dim though. I tried turning the engine over but when I crank it I just keep getting this clicking noise like the truck doesnt want to turn. Do anyone know what might be the problem or cause of the draw back of power from the truck?

I also have a 1999 tahoe which I love and I have replaced the battery 3 times since I purchased it used (2006- 50,000 miles). Each time it seems like the battery dies due to lights left on and then I can never recover the battery. Last week I left the lights on and jumped it off the next morning. Well I looked at the battery and it was dirty so I cleaned it up good figuring the alternator wasnt able to charge it well. And now its even worst. I just drove it about 30 miles and parked it hoping it would have charged. However, cut it off then tryed to crank it. Still having a problem starting. Any idea why this is happening? I also have replaced the alternator as well. It seems like I have a bad connection somewhere. I have had trouble with the interior lights flashing on and off too. This has occured a few months ago though.
HELP. Do I just need to get another battery?

I have a 1999 chevy tahoe and when I go to take off the radio cuts off, when I turn on the lights the radio cuts off, when I hit the brake pedal radio cuts off, or uses the wipers it cuts off, an even with all these things the truck acts as if its wanting to turn off. The power continuies like that when im driving it does it when it want to. Hopeing you can help me find what the problem may be.

Checked compression with my gauge they were all around 100lbs

Don't think gauge is accurate but they were all even. Starts and idles to good no miss at idle

I have a 1999 tahoe with 5.7 motor was rebuilt about 30000 miles ago. I have trouble starting it takes a few tries or will fire up with gumout. After it starts it will bogg down or almost die out if I hit the gas to hard or to far. I have tried doing plugs, wires, cap, and rotor. The fuel pump was replaced a few months ago. Replaced mass air flow sensor and it made no difference. Any ideas would be a great help

I think I am having the same problem. If you press the trhottle does it die?

Does it free rev and the transmission does not want to shift? Almost like you have no 3rd gear or does it go when you stomp on the gas but still runs like crap?

That's what I am dealing with now

Not any more mine will do no more than idle. At a loss
bout to give up on the tahoe

Replace the fuel pump it will be just fine

140,000 5.7. 4x4. I have a problem at acceleration. Very low power. When I hit the gas from a complete stop it acts like its starving for air or flooding? A good example of what is happening is, picture a manual transmission car starting out from a dead stop in 3rd gear. Once the tahoe gets to a certain RPM (2nd gear) it takes off like a raped ape. I mean it sits you right back in your seat. On the highway or in normal traffic, it has no hesitation or lack of power. Plenty of get up and go when passing. I have replaced the plugs, coil, Cat convertors, fuel filter, checked and cleaned EGR valve, checked air filter, and had to replace 1 O2 sensor because it was damaged while replacing the cats. NO TROUBLE CODES. I dont want to sink any more money into this and guessing what is wrong. It is an awsome looking and running vehicle other than this problem. It is also getting terrible fuel economy.