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Question
jharrypope
2003 Silverado, LS1 engine, mostly stock. No catalytic converters. Recently had to replace fuel pump, drove for a week and had no problems. had to take a road trip and 100 miles into the trip i get a flashing CEL. I pull over and use my handy scanner and i get the P0307 code. The only issue at that time was that it wouldnt shift into overdrive. Had plenty of power and I couldnt detect a miss. Anyways, after a little while it shifted into overdrive. This happened several more times, each time i would get a flashing CEL and the P0307 code and the tranny shifting problem and eventually the code and shifting problems went away. I also had the P0300 pop up once. Tried swapping coil packs around and the problem still stayed on cylinder 7. Did not try switching injectors as all of them were replaced about 1 month ago while dealing with another issue. Checked for vacuum leaks and found none. I have read many, many posts on this particular code but have not yet found one with the same symptoms as mine(transmission shifting). Wondering if during fuel pump install that some trash somehow got thru and clogged up injector in #7? Have tried fuel system cleaners and no luck. should i try a fuel injector cleaning kit or shell out some $$$ for a new injector?
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