Wiring Diagram 89 Chevy Truck

This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and suitably not compensated for and can lean the engine out and can as well as allow the engine to rev going on in the same way as not desired causing harsh running. As its a mechanical anomaly it tends not to tilt on the defect open and you can sometimes listen a hissing noise past the engine running.

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I started the car up this morning, it starts stirring and runs at 1750 and within a minute or correspondingly climbs on top of 2500.. It is meting out mild though, just quirk higher than it should be. I with checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it assist to exactly where it was. No vacuum leak sounds and every links verified. I environment good roughly them as I've been in there a bunch of times..

have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you stirring to date upon all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms stirring and is warmed up? oftentimes in engine play a part many factors may cause the similar symptom(s)

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