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When the idle goes rough, you must idle the plugs. Else the car plugs roughly.
Engine miss or rough idle, or broken motor mount
What causes a car to idle good and run rough when you give it gas?
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Check the idle air motor.
By a real Car a$$wipe
It could be your TPS, throttle positioning sensor. At least, that was the case with my 89 prelude.
Your car may stall or stop running after idle because of a problem with its fuel or electrical system.
I have 200,+ miles on the car. I change the plugs and wires yet it runs rough at idle and runs smooth at crusing speed. What can i do?
a longer cam shaft will make a car idle rough
The car will idle rough and hesitate during acceleration.
It is a common suspect in contributing to rough idle. See "Related Questions" below for more about the EGR valve, from testing to replacing.