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A common problem with all early model Diamante's (92-96)is the IAC or idle air contoller or idle stepper motor stops operating properly.If your D is idling rough or stops,look at the rpm gauge.If it falls below the normal range check the IAC.Replace with known good IAC and see if the problem persists.It's a quick and easy operation to change the IAC and will rule out this possiblity before causing you a headache and $$ down the drain.A bad IAC may lead to ECU problems over time.

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Q: Why does a 94 Mitsubishi Diamante shuts off when put in gear?
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