...idle speed and rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like ...
...indicate the throttle body needs cleaning. Second is you have a faulty Idle Air Control valve (IAC)' Third is you have clogged or dripping injectors. Injectors should have a smooth cylindrical ...
...will need to check other sensors... the MAF sensor is mounted on your air filter housing and the IAC is located on the throttle body...Zoom Image link: ...
...idle on a 93 mercury topaz? I would clean the throttle body first and the idle air control motor(IAC). Clean where the plate sits and on the back of it/them. You have to remove the IAC to clean
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