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
THROTTLING PROBLEM on 1991 GMC Vandura 1500
by Visitor in Orlando, FL on March 11, 2011
ANSWER by raiderron on March 11, 2011
Inspect for vacuum leak and check egr operation.
An engine vacuum leak may develop from the throttle body gasket causing a higher than normal idle speed. Failed gaskets should be replaced.