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Sorry if this is in the wrong spot. I dont see any 2012 areas? So I have searched threads here and haven't seen this issue with OUT codes being thrown. My daughters 2012 1.8 Elantra stutters under regular driving conditions. You will be cruising say 40-60 mph and it will stutter like three or four hits then run smooth again. On a normal one hour drive this will happen like two or three times. I ran a bottle of fuel injector in the tank to no avail.
I checked for codes and there no odes being logged. I don't want to just throw money at it. Things I think it could be and tell me if I'm barking up the wrong tree please.
Dirty fuel injectors ( I plan on doing the manual cleaning of those this weekend ).
Clogged fuel filter or pump issue?
Mass Air sensor bad?
Head gasket issue? (Ive read there is a way to diagnose this via spraying carb cleaner around the gasket area while running?)

TIA for any suggestions
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