98 gtp Odd stalling, changed crank sensor

**BoostedGrandPrix** · 08-09-2011

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!

**Scottydoggs** · 08-09-2011

did the misfire go away?

you could clean the throttle body if you haven't, there's a write in the how to section.

**txslow6** · 08-09-2011

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?

**BoostedGrandPrix** · 08-09-2011

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.

**BillBoost37** · 08-10-2011

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.

**JarenSTi** · 08-11-2011

possible maf sensor? i had the same problems.

**BoostedGrandPrix** · 08-11-2011

I have checked the maf sensor. And the thottle positioning sensor.

**Erks 03GT** · 08-12-2011

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