Okay I am having a problem that has plagues me for about 80000 miles and nobody can give me a clue including Ford. When my engine is warm and stuck at a standstill in idle it misses horribly like it is about to die. Occasionally at lights the tach jumps from 800 to a grand and then back down to 800. I have recently replaced the plugs, pcv valve, and fuel filter. It is also particularly bad after I park it for an hour or so come back and start it and back up. I have run Seafoam through the gas and also directly through the manifold. Any help is gratly appreciated. Thanks,
Ned