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Old 02-02-2012, 04:02 PM
martee373 martee373 is offline
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89 GM throttle body low vaccum on front ports of Throttle body

I have an 89 gmc sierra I just put a motor in and am expericening idling problems and acceleration problems. It acts like i'm losing vaccum somewhere but have checked several times and found no leaks. The front 3 vaccum ports of the throttle body have very little vaccum while the rear port that runs to the map sensor has normal vaccum...I have replaced the throttle body gasket and thoroughly cleaned the throttle body...does anyone have and ideas. I've been working on this truck for months and its getting very frustrating
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