man this is like tar...I spray the plugs with carb cleaner and it like peels off .... it doesn't dissolve it... I thought maybe it was the cheap non ethanol gas station but when the shell station started selling non ethanol 89 octane I started using that and it tars back up again....the regular shell with 10% ethanol makes it run like new almost immediately ... I don't think I have the only motor with this problem....maybe I just pay att. to these things more cause I was a mechanic but it just don't seem right...
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