alrite so me n my dad hav replaced part of the stock mass airflow sensor and we replaced tha tps sensor yet my car will be driveable one day n then tha next it will rev up 3 grand higher than it should n ive noticed that everytime it acts up my engine bay fan comes on when my key is turned into the on position...im extremeley frustrated by now n i hope sumone can gimme sum explanations er advice bc im dyin ta be drivin my car again...please n thanks!!

 

I dont know man, I would suggest taking the car in and getting a diagnostics test done.

 

The fan is coming when you turn on the key because the PCM sees a problem and goes into limp mode to protect the engine. The MIL lite should also light up at the same time. Get the car scanned & stop throwing parts at it.

 

Maybe your car's computer is on the fritz... I had to replace mine on a different car I had years ago -- a Mustang, as I recall

 

Which is entirely possible, but before you wind up to that conclusion, make sure you've covered all other possible scenarios. The first step would be letting someone do a complete diagnostic checkup on the computer.