When I'm at idle my rpm needle keeps bobbing up and down.. very subtle.. you couldnt even tell unless you looked close but I'm sure this shouldnt be happening.. any ideas on why this might be happening? clogged injectors? maybe need to clean the throttle body? TIA.

 

It's normal, the ECU is constantly attempting to lean the motor out as far as possible and this causes a slight RPM fluctuation.


EDIT: Oh BTW, this phenomenon is much more noticable once you add a free flowing intake. The ECU's idle control maps are programmed for the greater air velocity the stock setup provides.


[Modified by texan, 7:18 PM 2/10/2003]