I wonder...what air leaks have EFI owners found to be the most troublesome to find and correct? What were the fixes? Personally, I've had the loose air cleaner (self-induced) and also a ripped heated-air duct snorkel. Those were easy to fix. Exhaust leaks have caused performance problems as well. It seems that the HSP, if not seated properly on the manifold spacer, or not torqued properly can cause issues as well. From what I've learned about my car over the years, the system must be airtight so as not to cause mixture problems. The recent issue in regard to the EGR seating is interesting. Would it be a good idea to use a gasket sealer when replacing? Any input would surely help just about everybodywith EFI in future, especially those who are "new" to it. 81 black/heather for sale