Thread: 98 Grand Prix GTP 3800 II, Troubleshooting Rough Idle and Sluggish Acceleration :(

Oh i forgot i was running the plugs gaped at .035 to fix the spark blow out when boost would hit. i will set the gap back at .055 once i get home and see what that does for me. i am still at the stock pulley but i have a 3.4 sitting here but scared to put it on, want to get the car running good first. i get updates straight to my phone so i will respond as soon as some one else posts here.

Thanks

Once you get the gap set see what you get. Other than that, maybe check the fuel pressure w/ a gauge and see what its at. I know you put a new pump in but who knows.

And yea, wait on that 3.4. Unless you have the supporting mods for it you will be risking the motor for sure. If you haven't read it, take a look at the "Safely modding your 3800" post to see what you need to run this size. Hate to see someone go through all this just to chip a piston on a 3.4.

ok i will go to auto zone and borrow the fuel pressure tester and check it. What should the pressure be?