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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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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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