Question about 1985 Chevrolet Celebrity
Sounds like either a vacuum leak, a TPS throttle position sensor, an AIC air idle control valve, or worst case scenerio, an intake manifold gasket. Try spraying brake cleaner directly onto intake manifold at the gasket. If idle lowers, that is the problem. Also spray all visible vacuum hoses and listen for idle drop. Listen for air hissing as well. Good luck let me know if these are good tips
Posted on Jan 08, 2013
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Posted on Jan 02, 2017
SOURCE: rough idle at higher rpm smooth
You have a vacume leak somewhere. You can try to listen for it or you can get a can of brake parts cleaner and spray it around the engine. Anywhere there is hoses or connections of any kind. When you find the leak the engine RPM's will increase. If thats not the problem it could be your EGR valve is clogged or your map sensor could be bad. Those things would usually cause a check engine light. Vacume leaks wont. Good luck
Posted on Jun 19, 2009
looking at the throttle body assembly, after removing the air filter housing, opposite side of the spark plugs, about an inch or two down, you should see a electrical connection, with four wires, the IAC has two small torxs screws that hold it to the throttle body.
Posted on Dec 22, 2009
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