Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - 89 GM throttle body low vaccum on front ports of Throttle body
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Old 02-02-2012, 10:41 PM
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Ron has my thoughts exactly. You mentioned you cleaned the TBI but did you run something through each port to assure it was clean? TBI engines have a real bad habit about carbon build up. When I removed the one off my truck I found one completely caked shut with carbon and the other two were almost just as bad. If it's getting normal vacuum at the rear port then it should be on the front ports which points to there's got to be some blockage somewhere.
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