This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and therefore not compensated for and can lean the engine out and can as well as permit the engine to rev stirring behind not desired causing scratchy running. As its a mechanical irregularity it tends not to perspective upon the deviation well-ventilated and you can sometimes hear a hissing noise as soon as the engine running.
I bought it in July, drove it home from LA (to Utah), and the problems started sharply after I got it home.Any extra incite you can pay for is appreciated. I don't know what else to reach but admit it incite to the dealer. I know I've got the shop foreman involved on it at the dealer, but I still mood its pushed to the back up as its pass and everyone loses in this situation.
This could be a large vacuum leak ,with the MAF aligned it is only measuring the expose that is getting behind the MAF, appropriately if the intake manifold is sucking in ventilate the let breathe to fuel ratio will be certainly out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. taking into consideration carb cleaner spray spray can in the place of the hissing similar to the engine direction and later you hear the engine stall or rev well ahead there is the leak ,could be a bad vacuum hose bad gasket on the manifold.