Originally Posted by realholdem
the obd 2 system shows p 507 code. which stands for idle control system failure, rpm higher than expected. also sometimes when i'm run from stopping for stop sign. it feels like the car is not following my pedal, then it will eventually respond to my gas pedal. but only happen within 3 sec. i don't know if this is significant to the fuel regulator. i checked my vacuum system it seemed that their ok. my iac is fine. and there's no vaccum leaks. this problem occured after i replaced my 2 fuel injectors, [U]and crean my upper vacum manifold from carbon build up. [/u]
My thinking is you have cleaned out carbon build up which is allowing more air past throttle plate, idle valve has lost idle setting, is it possible to check and reset throttle position switch?