>> ...or when I'm just
>> driving along.
>>
> Idle air control valve is dirty/worn.
What do you mean 'just driving along'?
When you release the accel? If so, then may be the IAC, as Sharon Cooke
says.
If it dies at cruise, or anytime foot is on the gas, that's different.

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Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price
you pay..DEAL with it!