I've searched high and low on this forum for an answer thinking someone else has to have had this problem before, but I found nothing. The car is a 99 camaro ss, manual transmission and absolutely stock save for cat-back exhaust. Not even a tune. A friend asked me to look at it and tune out a problem he is having, but I don't understand what's wrong with it. Every time the engine gets between 5500-6000rpms, it reduces injector duty cycle for some reason.
I'm not sure how else to explain it. Have a look at the log in that RPM range. Anybody have a clue what this is?