Stumble/Chug driving off after cold start

2007 6 cyl Accord EX-L sedan, 56,000 properly maintained miles. No check engine light, no obvious loose/damaged wires or hoses.

On morning cold start in Park-- catches immediately with RPM about

1100-1200. Idle is a bit rough-- though accelerates smoothly up to 3000-4000 in Park. After a few minutes, RPM drops to around 800 or so, idle still a bit rough.

The problem though is driving off at any point in these first few minutes, car chugs/stumbles right before up-shift point. The colder the outside temperature, the worse it is. After driving for several more minutes though, car then operates normally until restating the next morning.

Also, after a cold start, if I let it idle until the thermostat opens and the fan cycles on, it drives off normally.

Any idea what the problem is?

Reply to
H.L. Hunley
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Air in the cooling system.

Bleed it.

Reply to
News

Well, did that. There wasn't really any air in there. Still doing it :-(

Reply to
Aldo Raine

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