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Getting a code for which cylinder is misfiring?
Boss's had a miss fire, had shop diagnose and replaced it, then another replaced it himself. Doing all 4 upfront would have been cheaper than one shop visit. On the injectors I think it was telling him which cylinder so just replaced one, not much later another one went, that time replaced the other 3.
I chased a occasional LTFT (long term fuel trim) issue on my Cobalt causing flooding, did coils, injectors, O2, still randomly come back, one day funny noise when got to work and it was the evap purge valve squeeling, replaced it and good for a few month. Came back, replaced it a again with different brand part it it's been good for a while. I really didn't think enough air could leak through that hose to max out fuel trims. Code was always a lean code even though the car was flooding itself.
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