Check timing. idle could also be set too low (rpms) so vibration is increased.
Engine dieseling Runs too hot or idles to fast Try leaving in gear when shutting off
oil leaking on the ex man fold need to fix the oil leaks
Might be time for a tune up, new plugs, fuel filter, pcv valve, cap and rotor and wires if aplicable.
When you are parked or in neutral while the car idles, your engine will shake. The vehicle will also get poor gas milage. Bad gas can also cause engine failure.
my 91 Honda prelude 4ws si with 2.1 engine had high idle in park. then my timing belt went put a new belt on hasn't done it yet!!! I do not fix them, I bring it to the dealer and let them fix it.
Could just be throttle plate sticking--without engine running try to free with a screwdriver Could just be throttle plate sticking--without engine running try to free with a screwdriver
Acceleration Cable broken broken, you dump!
Adjust the idle screw.
check make sure the firing order is correct.
zyou tps might be bad
On my Chevy truck it idles high when its low on antifreeze but if its not that more than likely its usually a vacuum line loose or cracked. good luck.
Vacuum leaks. Get a can of throttle body cleaner and with the engine idling and warm, spray the throttle body cleaner anywhere you have or see vacuum lines. Just a small squirt and see if the engine picks up revs. If it does, you have a vacuum leak. Fix that oen and then go spray again at others. While you are there it's best to try to locate all. The engine idles fine because the engine is not under load and your ratio of fuel to air will let the engine idle but when you press the throttle that puts the engine under load and now the engine suffers from too much air due to the vacuum leaks and it stumbles.