... but sometimes RPM creeps back up while driving. Likely cause?
SOURCE: 96 Jimmy 107,000 miles. Idles high at
You have a vacuum leak somewhere. Possibly an intake manifold gasket or a vacuum hose that has come off. Open the hood with engine running and see if you can hear a hissing sound. You can also buy a can of aerosol carb cleaner and try spraying it at suspect locations. The carb cleaner will cause the engine speed to change if you hit the spot where the leak is.
Happy New Year,
Dave
SOURCE: 1996 chrysler concorde 3.5 that when started the
mcdevito75 here, It could be the air idle sensor or motor, have your shop run a scan or change this air idle motor / sensor.
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