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Old 09-21-2004, 03:13 PM
 
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Question engine surging until operating temp

I have a 87 gmc with a TBI 350.On startup the engine surges-------hi to low idle speeds.When engine warms up it idles just fine. Anyone have any ideas to what might be causing this?Thanx

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Old 09-21-2004, 03:15 PM
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A small vaccum leak or perhaps a faulty or dirty Idle Air Control Valve. I would lean towards the valve as normally a leak small enough to seal with metal expansion isn't large enough to cause major engine surging.
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Old 09-21-2004, 03:34 PM
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I would also check fuel pressure, 9-13 lbs!
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