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I have no idea, plz help

R

RissaGT00

New member
So, here it goes! I bought a 2000 Grand Prix in January of this year! For the last 2 - 3 months I have been having trouble with it & have put a lot of money into fixing it! It has 129,000 miles on it and I have done regular maintainace like oil changes, plugs & wires. I replaced the transmission at about 125,000 miles & the alternator just today.

So heres the problem..

When I am driving the car it will start slowing down & won't let me accelerate. The RPM's will jump & drop while this is happening & my check engine soon light flashes on and off. Then it will suddenly stop doing all that and drive perfectly. I have found that it does not do it when my heat is off. I have no idea what that has to do with it what so ever but it works for now! When all this is going on it also isn't throwing codes! Could it be a short in the electrical system or what?

I just need some help in determining what could be wrong!

Thanks a bunch!
 




a clogged cat makes a car do all sorts of funny things... including stumbling rpm's and the check engine light flashing means misfires... also something a severly clogged cat can do. so it is just as possible as the cps
 
He never said it drops to zero, just that it jumps and drops, my money is on either the crankshaft sensor or the throttle position sensor
 
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