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Could be a quite a bit of things. I would start with the easy things and try to clean out your EGR valve.
I would look into checking the MAP sensor. If a map sensor isnt hooked up properly you will be running very rich. We discussed this in an earlier topic. (Black Smoke out the exhaust)
If the map sensor checks out, I would check your system for vacuum Leaks
Grab yourself a 6oz can of sea foam and spray the entire bottle in your intake holding the throttle at 2000 rpms. After that, let it drop back down to idle and turn the car off. Let it sit for 5 minutes, and then start it back up and drive it aggressively to remove any excess carbon build up.
If everything checks out, I would check the spark system. Could be something as simple as a dirty spark plug.
If all your plugs are clean, make sure the wires are good. Check the gap between each plug to confirm they are within factory spec. Look for signs of pre-ignition.
Pull the cap off the distributor and check the condition of the cap pickups and rotor.
If you haven't preformed a tune-up in a while (Spark plugs, wires, air filter, etc..) I would do so anyhow
Last edited by Mister_Perkins; 10-15-2010 at 09:50 AM.
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