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I 've had the same problem for sometime. I also have a slight hesitation when starting sometimes, not sure if its a related problem, I wonder if it is the 02 sensor ,got me thinkin after a couple people mentioned it, was looking back through old maintenance checks and they did have 02 sensor circled ...

I've had this problem before but then it seemed to go away which makes me think its bad gas. On some starts only usually after sitting overnight, there is a slight hesitation (1 sec) between starting and turnover, seems like a fuel or air restriction. could it be a dirty fuel or air filter or ...