1999 Other Mazda Models Engine Idle stick

There is an idle speed control module, a TPS, and the module resets these when you switch the key off. Have someone scan your diagnostic connector for codes that help a tech. Find out what the problem is, as loads increase and decrese, air flows change. The air flow sensor may be bad, depending on the model. Ok, There may be a computer fault code. Idle speeds are sort of a controlled vacuum leak and a motor(small) is used to determine all engine speeds off idle.