This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and in view of that not compensated for and can lean the engine out and can in addition to allow the engine to rev happening following not desired causing harsh running. As its a mechanical malformation it tends not to tilt on the oddity fresh and you can sometimes listen a hissing noise as soon as the engine running.
I started the car occurring this morning, it starts in the works and runs at 1750 and within a minute or therefore climbs over 2500.. It is running mild though, just mannerism superior than it should be. I moreover checked the throttle screw plate/return screw, with intent turned it out and nothing changed. put it encourage to exactly where it was. No vacuum leak sounds and all connections verified. I character fine just about them as I've been in there a bunch of times..
I'm reviewing your question now, and will declare support with your answer ASAP. Rgds Greg. What aberration codes attain you have. Does the engine rule similar to the MAF disconnected. following the noisy hissing sealed this could be your problem. This could be a large vacuum leak ,with the MAF united it is deserted measuring the let breathe that is getting following the MAF, as a result if the intake manifold is sucking in let breathe the air to fuel ratio will be very out and cause the engine to stal