Thanks for the insights! This 87xj was manufactured in the fall of 86 and every third or forth start was real rough. Turns out the distributor was installed one tooth off. Anyway, I corrected that about 70,000mi ago and now at 148,000mi, every now and then I get a bit of a rough start remanicent of the old days. I have an 84-87 manufacturer shop manual that has old bullitans bound in the back. There is one about early cars assembled with the distributor off by one tooth(mine) but the bullitan does not say anything about the .020 gap setting procedure.