As far as gas recommendations---for our customers that we are dealing with a tuning issue we STRONGLY insist that they have SHELL or BP---none of the off brands/convenient stores---


That carb tuning, dieseling,AND oil leak on the left side are all related to that ill fitting CHROME THINGIE on the left valve cover that is hooked to the carb base with braided hose---hugh vacume/oil laek and he has to be 2 1/2 turns out on idle mixture screws to give enough fuel--------


Also----on older GM ignitions---the inner shaft/advance mech seizes/rusts and won't advance/retard properly---causes mechs to chase timing problems as it sticks closed so they give it more advance , then it sticks advanced, get rattle/spark nock and then the mech retards it--then says carb must be bad, changes carb, etc, etc, etc,etc