I have a 2002 chevy impala with new plugs, fuel filter. it runs but cuts out and wont go over 30mph if you give it throttle in park then it wont go over 3000rpm and cuts out. any answers?

SOURCE: 2002 chevy Blazer hard starting

replace the fuel injectors, that is the likely cause......

to test the injector, take the power clip off the top of the injector, take one wire and ground it to the body of the car, and another form the battery, to the other post on the injector, if you do not hear a pulsing sound coming from the injector it is bad, if you do, then you have a wiring problem.

SOURCE: 98 chevy camaro wont start

check fuel pressure regulator

SOURCE: 2002 chevy impala has loss of power. will not go

I would look into the catalytic converter too. I just went through this same symptoms. The engine will sputter and run rough. Drive a few miles at night and see if the front exhaust pipe, right behind the radiator, is glowing. That keyed me in. There is a special service to fix certain models for 01 and 02 which is sort of a recall but not exactly. The dealer just fixed it for free. The chevy customer service number is 1-800-630-2438, they can check and see if you Vin number is on the recall. Your local dealer may not know about it so call the number first and make sure you have the Vin, at least the last 8 of it, when you call.

SOURCE: 1997 K1500 z71 4X4 Chevy (Throttle position sensor)

does anyone know where the throttle position sensor is located on a 1997 chevy Z71 truck ?

SOURCE: Problem with the 2008 Chevrolet Impala 2008 chevy

the shift lever solenoid is going bad, you didnt mention if it was a column shifter lever or console shifter so i cant tell you how to bypass it, same problem with my chevy,hope this helps, you may need to get this done by a dealer or honest mechanic, if you can find 1, but im sure it will help you out if you look like you know what your talking about, im sure this is your problem! good luck