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Chevy Aveo Misfire or Normal
I am currently trying to run a few bottles of decent fuel injector cleaner because I'm wondering if water got into the gas due to sitting for a long while with a bad gas cap and heavy rains. It seems to have gotten slightly better after I put some cleaner into the tank. It doesn't hesitate or stall at any other time and runs smoothly on the highway. When it warms up, it is better, but not non-existent.
Is it normal for this engine to run unevenly or feel like it has a misfire? I've noticed one other GM MPFI vehicle having an uneven idle, too. I'm used to throttle bodies and carburetors, so I don't know if it's behaving correctly.
Also, aside from getting a fuel injection service, are there any good fuel injection cleaners I can get from an auto parts store?