AT AN IDLE, IN PARK OR IN GEAR, THE ENGINE SPEED OFTEN RISES FROM NORMAL (1000RPM) UP TO AS HIGH AS 4000 RPMS. THIS HAPPENS AT A STAND STILL AND ALSO WHEN APPROACHING, SITTING AT OR LEAVING STOPP LIGHTS ALSO. THIS PROBLEM HAS CAUSED UNWANTED AND UNSAFE "LURCHEING" FORWARD WHEN LETTING OUT THE CLUTCH. AT TIMES, WHEN THE ENGINE SPEED COMES BACK DOWN, IT WILL DROP TOO FAR AND CAUSE THE ENGINE TO STALL. THIS HAPPENED TO ME IN THE MIDDLE OF A BUSY INTER SECTION AND I WAS NEARLY REARENDED. TO MY KNOWLEDGE GM IS AWARE OF THIS PROBLEM BUT REFUSES TO TAKE CARE OF IT OUTSIDE NORMAL WARRANTY PERIOD.*AK
1991
ELECTRICAL SYSTEM:IGNITION:MODULE
GENERAL MOTORS USED A SHRINKING SEALANT ON THE COMPUTER BOARDS IN THESE CARS WHICH THEY HAVE SINCE QUITE USING AND ADMIT IT WAS A PROBLEM, BUT STILL USE IT ON THE REPLACEMENT PARTS WHEN THIS SHRINKS IT PULLS THE COMPONENTS ON BOARD LOOSE, CAUSING POOR IDLE/ HESITATION AND STALLING EVEN DURING ACCELERATION (IE WHEN PULLING OUT IN TRAFFIC). *AK