i just replaced my lower intake gaskets as well as the upper intake and gaskets. Before i did this my car would stall while driving after it warmed up but i could put it in neutral and it would start right back up. Now that I have changed the gaskets it has a very rough idle. It ran very smooth before then. Even when i remove the oil cap it will stutter. And it even started emitting some light black smoke. Can anyone help with this problem. 2000 Monte Carlo SS series 2 3800.

 

Check all of your vacuum lines first.

 

Double check the injector wiring and make sure you didn't accidently get a couple of them mixed up. Also check the connectors on the IAT and MAF sensors.