Have you cleaned the carbon out of the Idle motor? Try driving in 4th gear 40 mph, give it gas, does it surge but still accelerate? If so, the ignition wires should be changed. Coil packs go bad, see if there are black carbon trails on the surface. I had a carbon track on the #2 plug (middle rear) but you changed the plugs. Did you use the Autolite double platinums? Maybe your oil pressure is low, you should not jump time so easily. Check egr,and see if there are any codes stored.
