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There can be many causes of a rough idle. But if the engine runs good under acceleration and then idles rough, there are 2 things I would look at. First look to see if you have a vacuum hose disconnected, broken, or cracked. Secondly depending on the make and model, check the EGR valve. This is just the main 2 causes as there are more.

-also rotor and distributor cap arcing - use only original dealer parts

-O2 sensor slow - if it is old replace

-ignition wires old or incorrectly routed

-if gas smell do a fuel pressure leak-down test - should hold 50psi for 10 mins or more. May be pressure regulator or line leaking or bad fuel pump

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15y ago

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