i had the same problem with my 93, and tried all the same things. it turned out i had to replace the entire distributor, not just the cap. what sucks even worse is that after two weeks, it starting doing the same bs again. i was fed up and didn't know what was wrong, so took it to a mechanic, and it turns out that it was my distributor once again. the part was under warranty so i got it exchanged at the part store i bought it at, but i still ended up having to pay for all that unecessary labor.