Question: Rough idle on cold start
I've noticed on some cold mornings I'll start my 02 Altima (starts right away) and it will idle roughly like it's misfiring (SES light blinks). It eventually smooths out when warmed up. Everything I'm reading seems to indicate a failing head gasket, but I'm not seeing any of the other signs (i.e. coolant loss, "milky" looking oil, coolant on cylinder heads, etc.). What else could it be?
Richard W
Expert Mechanic
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