Having problems with your 1984 Cadillac DeVille ?
Idle surges up and down on 1984 cadillac coupe deville
\015 When the car is in park, running at any temp. the idle surges up and down.\015
I A C motor small part on throttle body ,controls idle mixture when they fail at idle the engine "hunts" for proper air/fuel mixture . when defective it causes o2 sensors and TPS to compete to set an idle thus the up n down effect.. auto wreckers if your broke new from your local parts store....dealer to much 1 plug in two bolts for most applications
Repair Help & Product Troubleshooting for 1984 Cadillac DeVille
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