Join Date: Aug 1998
Location: Waldorf Md. USA
I think you are trying to overcomplicate it. I doubt that an intake valve just decided to stick open. More than likely, something you did is incorrect. This is of course assuming that the car was running ok before the "tune up"
I have seen bad parts plenty of times. Caps can crossfire etc. I would double check eveything before thinking the worse. Have you set the points properly, the best method is with a dwell meter. Double check the firing order, its real easy to get #s 5 and 7 mixed up and they will cause a backfire.
Hope this helps,
Advanced Automotive Machine