Hello, Pontiac Grand am 1997 V6 SFI 3.1L has an intermittent problem with idle. Sometimes when warm engine is started in P idle will jump up and down very fast from about 300RPM-1200RPM only when engine is warmed up and only in Park. As soon as transmission is shifted form P to D no problems at all. No vacuum leaks, no DTC. TB, IAC EGR are all good and clean. Please help
Apr 2, 2009 at 2:16 PM
