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98 gtp Odd stalling, changed crank sensor

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BoostedGrandPrix

New member
I have a 1998 pontiac grand prix gtp. I have only had it about a month. It had a small miss so I put plugs and wires on it . Since then it dies at a stop and the rpms drop suddenly on and off. I have changed all the censors under the hood including crankshaft positioning censor. I have also put new coil packs on it. It isnt throwin any codes. I have also checked the intake gaskets. IM STUMPED! ! ! Please help!
 


Before you started throwing parts at it did you check the GM service manual and diag it? Or did you take a multi meter and do some tests?

Did you hook a scanner up to it to see if it's misfiring and if so which cylinder?

Have you tried doing a compression test on it yet?
 
It isnt throwing any codes and the missfire did not go away. Thats what I dont understand. I have had it in the shop and know one seems to know why its actin like that. Ill try to clean the throttle body tomorrow.
 
You say you've changed a bunch of stuff. Please elaborate.

I see
Crank shaft sensor
Coils

Have you checked the ICM? These are tough to test, as they will often test fine and only act up when hot.
 


Check the fuel pressure regulator.. remove the little vacuum line attached to it and if even one little tiny drop of gas comes out means you need a new one.. mine was doing the same thing just randomly dying and dropping RPM's.. changed it last week and runs like a champ now
 
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