Were all four injectors impaired? I do not know. I did put in a set of good used ones. They came from a 1990 that I sold to a friend a long time ago. I cannot remember why he changed them, but I do know they did not solve his problem. Either way, I knew they were good.

I have no doubt that the injectors were at fault. I did not touch the intake gasket yet. I did not disturb anything else, so it is not likely that anything was accidentally "fixed".

I anticipate being asked about the two ground wires that are secured with the injector rail. Yes, they were checked, cleaned, tightened before and were not the cause of any problems. I did not swap the rail, or the fuel pressure regulator with it. etc....

Duty cycle before change was about 5.5% at idle. After the swap it runs about 3.8-4.0%. It is a Sunpro digital multimeter that I bought at least 5 years ago for auto use. I do not remember the model# off the top of my head.