if its only on idle it sounds like a bad injector
High idle, misfire, check engine light,High idle, misfire, check engine light,
The engine will have low compression and misfire, especially at idle. The misfire will seem to disappear at higher RPM.
Probably a misfire, it could be in need of a tune up.
Cylinder misfire. Possibly failed or failing engine mounts.
what does idle funny mean? Does the whole car shake? (upper engine mount collapsed) Or does the engine shake/misfire? (Intake manifold gasket)
Possible cylinder misfire and/or failing engine mounts.
Check engine light is on with a misfire code, rough idle, lack of power, low compression.
Code 33: Mass air flow (MAF) sensor Signal voltage or frequency is high during engine idle OR Manifold absolute pressure (MAP) sensor Signal voltage is high during engine idle. Engine misfire or unstable idle may cause this code.
If the check engine light is blinking , that means a cylinder misfire has been detected
could be distributor cap or rotor
could be a number of things cracked distributer cap, bad sparkplugs bad plug leads,setting, or bad igntion condensor if automatic transmission,it could be automatic idle adjustment on engine
My idle was running rough and slight loss of power (5 cylinder engine). The power loss is more noticeable on cars with less cylinders.