1994 Cadillac Concours surging and stalling

1994 CADILLAC DEVILLE CONCOURS
94,000 MILES • V8 • FWD • AUTOMATIC
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WILEY0NE
  • MEMBER
  • 1 POST
had coil replaced now when you release throttle it starts surging and often stalls at a stop
Feb 15, 2009 at 3:51 AM
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FACTORYJACK
  • ✓Experienced Mechanic
  • 4,159 POSTS
Sounds like possible faulty nose switch in the ISC motor. It is responsible for detecting the throttle arm at a closed position and taking control of idle. It could also have a vacuum leak.
Feb 16, 2009 at 1:50 PM
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