It is possible you have a lean condition, it is also possible you have a ignition timing issue. It is also possible that you have a RICH condition
Maybe an ignition guru would jump in here, and talk about distributor advance on this particular engine.
If it turns out to be lean or rich, give me a call, and I will explain some testing.
Jon.
Last edited by carbking; 12/04/2007 8:12 PM.