Re: Engine revs up randomly only when moving in neutral 2.5l
Throttle position sensor would be my guess. In order for it to rev up like that, it needs air and fuel. A stuck IAC or vacuum leaks would be allowing in more air but the fuel would not increase to keep up with it. Also since it sounds like it has picked a rather consistent RPM to increase to, I thin that further points to the TPS.
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