This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and suitably not compensated for and can thin the engine out and can in addition to permit the engine to rev occurring subsequent to not desired causing harsh running. As its a mechanical malfunction it tends not to turn on the defect vivacious and you can sometimes listen a hissing noise following the engine running.
I bought it in July, drove it house from LA (to Utah), and the problems started quickly after I got it home.Any extra back you can allow is appreciated. I don’t know what else to get but tolerate it back up to the dealer. I know I’ve got the shop foreman enthusiastic on it at the dealer, but I nevertheless atmosphere its pushed to the support as its antiquated and everyone loses in this situation.
This could be a large vacuum leak ,with the MAF united it is single-handedly measuring the expose that is getting with the MAF, for that reason if the intake manifold is sucking in freshen the ventilate to fuel ratio will be definitely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. in the same way as carb cleaner spray vaporizer in the place of the hissing subsequent to the engine organization and following you hear the engine stall or rev higher there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
Photo Schematics for avalanche engine diagram
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