Engine losing power?

Here's the many symptoms my car is having- upon start up, idle revs to almost 2000 rpm and stays there for a few minutes before finally falling to 1k; when driving, if I turn on the blower or push both window controls at the same time, the lights dim and the rpms drop; the car has horrible acceleration, almost like it is straining to go faster; absolutely no response when I push the gas pedal. I'm not a mechanic, but more of a weekend warrior. Car has new Mass airflow sensor, throttle position sensor, air filter, tuned up recently. Really stumped as to what is causing this? Any help would be greatly appreciated!

I had autozone check the charging system and said the battery and alternator check out perfect. Any other ideas what would cause this? Not sure if it's related, but when I kick on the blower the motor loses even more power and it also shutters in spurts (almost like the car got goosebumps real quick and had a little shaking fit). Ever heard of those things or what could be causing it?

Also, somebody mentioned the IAC may be faulty? Is there a way to check the old one before going and buying a $50 dollar sensor?

Need help tired of just changing parts.

My catalytic converter has been replaced, and air flow censer has been replaced, and my fuel filter has been replace. My car still hesitates and back fire after engine gets hot. While idling the car run find going up a hill it dogs out as if it is running out of gas than it back fires.

Electrical problem
1998 Ford Taurus Two Wheel Drive Automatic 150000 miles

I get into my car at times and my radio is zeroed out like the battery has died however, the car starts just fine. Then when I drive the car and go from a higher RPM to a lower RPM all the lights in the car and the radio and A/C go all dim/out but they come back on instantly. Only have had the battery act totally dead twice once my husband jumped it and it was fine the second time I went into the house to get him left the keys in the egination and by the time I got back all the lights were on and it started gine. The headlights do intermittenly flicker from regular to dim. The ground wire was loose so we tighted that, he battery has been checked and is fine, the AIC had acted up but reset when we unhooked the battery as suggested by your site.
Any ideas? The guy next door is a car guy and he says when the lights and a/c are going out the engine is not losing power that it is electrical which he does not do.

The grounds have been checked and tightened and because it is only the lights and a/c I have been told the altenator is fine

Not real sure but it has been doing this for a couple of months. Could it be the voltage regulator and in this model is it in the alternator?

Vehicle starts and runs good for driving. All fluids are where they need to be. When I first start the car in the morning and the first complete stop I come to the car will not accelerate foward, RPMS's will go up. I have to either shut the car off and turn it back on for it to accelerate or I can put it reverse and then back into drive for it to accelerate. It will do it at most complete stops but has no trouble shifting gears, getting put into gear, or accelerating once it actually goes.

Car has new cadiltic converter oil in exhust and engine has no power but will eventually arrive at the desired speed. Thank you.I will give a donation if I get a decent answer.(And I am sorry I dont mean that rudely.

Whats does it mean when service engine light flashes. Question 2 the car is a 98 taurus and when the gas is hit it shakes and feels like it either wants to shut off or hardly no power. The car when moving seems fine besides a little hesation what could it be.