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General Motors' GMT400 platform.

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1997 tahoe idles rough when first started

wondering if there is an electonic choke funtion for when engine is cold? it goes away once engine is warmed up.

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There is no choke on a computer controlled car. First step would be to check the computer memory for trouble codes. Since the problem is temperature related, I would check the coolant temperature sensor to see if it is giving the computer the correct reading.

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Have you replaced the O2 Sensors? (BTW you might have more then 1) They control the fuel/gas ratio so they can really jack stuff up if they are really old or clogged up with gunk. BTW you cant clean them, you have to replace them.

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lawrence will be eternally grateful.
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