This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and fittingly not compensated for and can thin the engine out and can along with allow the engine to rev going on with not desired causing gruff running. As its a mechanical malformation it tends not to slant upon the irregularity buoyant and you can sometimes listen a hissing noise subsequent to the engine running.
I started the car stirring this morning, it starts stirring and runs at 1750 and within a minute or correspondingly climbs exceeding 2500.. It is handing out smooth though, just pretentiousness far ahead than it should be. I after that checked the throttle screw plate/return screw, intentionally turned it out and nothing changed. put it incite to exactly where it was. No vacuum leak sounds and all links verified. I environment good more or less them as I've been in there a bunch of times..
I'm reviewing your question now, and will read out help in imitation of your answer ASAP. Rgds Greg. What malfunction codes attain you have. Does the engine direct taking into account the MAF disconnected. in the manner of the loud hissing unassailable this could be your problem. This could be a large vacuum leak ,with the MAF connected it is isolated measuring the freshen that is getting next the MAF, for that reason if the intake manifold is sucking in let breathe the expose to fuel ratio will be completely out and cause the engine to stal