I ONLY use Shell Oil - regular. Not sure, but I think it's 89 octane. I've always used it. Never had this problem before.

Yes, the dealership just worked on it, and no, they didn't fill up the tank.

Back in the day when my car was new, I used Premium once or twice, but I never noticed any difference, so I've been using regular ever since.

Any more suggestions. Maybe I will try the seafoam. Unless it will hurt something if I don't need it.

My cars getting up there. 137K miles on it now, 1997 Integra. I'm trying to make it last to 200k before I chunk it.