THROTTLING PROBLEM on 1991 GMC Vandura 1500

MY VAN RUNS GREAT BUT RECENTLY I HAVE THROTTLING PROBLEM THE WILL CUT OFF WHEN STOPS OR EVEN SOMETIMES WHEN I PUT IT DRIVE I CHANGE PLUGS,WIRES,ROUTER, DISTRIBUTER CAP,TPS AND THE AIR CONTROL VALVE AN TI STILL HAVE THROTTLE PROBLEM PLEASE HELP THANKS IN ADVANCE

by in Orlando, FL on March 11, 2011
1 answer
ANSWER by on March 11, 2011
Inspect for vacuum leak and check egr operation.
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An engine vacuum leak may develop from the throttle body gasket causing a higher than normal idle speed. Failed gaskets should be replaced.

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