My engine is started to irritate me. At idle it shakes pretty bad. I can put my hand on the manifold and almost feel a cylinder not hitting. It has been doing this for a while but last night i replaced my plug wires and it went away for a short while but now it is doing it again. I can't visually see any arcing parked in a pitch black spot at night. It idles pretty low too at around 560-630 and will barely run in reverse. Thanks for the input.

 

Check the opti spark, My 94 did the same thing when the opti took a vacation.