Question about 1988 GMC V3500

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1988 cube van with 350 tbi. surging at idle and will eventually shut off. will not throttle up but very little. replaced fuel filter, dist. cap, rotor button, plugs, wires. thinking MAP or IAC? how to test either or both?

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The throttle body used to get carboned up where the map senor passage is pull the vacuum hose off map and check vacuum if vacuum is not present remove throttle body nad clean passage

Posted on Sep 22, 2008

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