You need to find out one way or another what is going on. It could be a bad injector, wire, or plug. When you say revs below 1000 rpm is that a surging of the engine or is that a rough idle. Normal idle is around 750 rpm.
Pull of one of the plug wires at a time while the engine is running. See if the removal has any effect on the idle. If one of them makes no difference in the way it is running replace the wires or the plug to fix it. However, if that doesn't find the problem, I would go with a removal of one injector at a time.
Another option is to look at the EGR valve. Take it off and clean it.
No Check Engine Light on?
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Tuesday, June 19th, 2007 AT 7:38 AM