Start simple here. The oil in the plug wells is not only a pain in the butt but it causes the plugs to not always fire right. There are other side effects as well. SO. Go to the parts store and get a valve cover gasket kit. Make sure it comes with the seals for the plug wells.
Other things I mights suggest are cleaning up the well real good and cleaning the plugs. The wires can be effected as well and can cause the fowling of the plugs. Blowing black out the rear starts with black on the plugs and that is an indication of unburned gas. Get that job done.
Next I would check the air filter. Then I might consider having the timing of the car set. IF there is still no improvement and given the age of the car, I might consider replacing an O2 sensor.
Got enough to start with I think. Good luck!
Thursday, June 28th, 2007 AT 8:02 AM