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Repace the ICP also look at the plug closely for oil fouling replace pigtail if bad.
Odds are the resistance in the ICP is bad which can give false readings, is it leaking oil ?
About the leaving it unpluged, the PCM estimates the ICP pressure and it can run ok as long as the sensors it's running off of are close map ebp maf get it fixed asap.
Should not cause any problem as long as it's keeping up on injector pressure, may run bad at higher speeds though.
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Last edited by mhatlen; 01-28-2013 at 06:51 AM.