Originally Posted by Andreas2k10

All sparkplugs replaced. I read somewhere that the gap should be around .40. Correctly gapped and installed 8 new plugs. The old plugs were so work, it wasn't funny. The gapping on the old plugs was up to .80, they were worn and old. I don't think they had been changed in a loooong time.
So, again started the car and the rough running continues. No check engine lights on.
You can feel it vibrate pretty good. No misfires, no stalling.

Will take distributor cap off next and check for anything.

Question now: Is it possible for the timing to be off ?
Acnd how do you check?

Thanks in advance!