Mazda Repair: rough idle, mass air flow sensor, mass air flow

Question
QUESTION: I just recently purchased a used 1999 protege LX 1.6L!  It had been sitting for a few months so I have flushed new gas with antifreeze in it, plus another tank with fuel injector cleaner.  Both times I filled with high test gas.  Since then my idle is still rough!  I have check vacuum leaks, changed plugs and wires and MAF.  What could still be wrong?

ANSWER: it could be your idle solenoid or it just may need to be ajusted that's something that should be done by a tect as there is some tools needed that most people don't have

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QUESTION: where is it located on the engine and is it a part that usually defaults?  My engine surges and sputters a bit at idle, is this caused by the idle solenoid as well, or can it be caused by a bad fuel pump?

Answer
your mass air flow sensor could be dirty or the injectors dirty also, the solenoid is on the throttle body and to set idle speed you need a timing light and a tach gauge normally you can get a can of cleaner for the sensor cheap at a local parts store. there should also be a screw on the thotle that looks out of place by turning that in and out you can try a tune the idle by ear but i still advise you have a pro do it