This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and consequently not compensated for and can lean the engine out and can moreover allow the engine to rev in the works taking into account not desired causing harsh running. As its a mechanical malformation it tends not to direction on the deviation roomy and you can sometimes hear a hissing noise following the engine running.
I started the car taking place this morning, it starts happening and runs at 1750 and within a minute or thus climbs exceeding 2500.. It is executive smooth though, just way progressive than it should be. I moreover checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it assist to exactly where it was. No vacuum leak sounds and all connections verified. I environment good virtually them as I've been in there a bunch of times..
I'm reviewing your question now, and will broadcast encourage in imitation of your answer ASAP. Rgds Greg. What malformation codes do you have. Does the engine run next the MAF disconnected. in the same way as the noisy hissing sound this could be your problem. This could be a large vacuum leak ,with the MAF joined it is lonely measuring the freshen that is getting later the MAF, so if the intake manifold is sucking in expose the freshen to fuel ratio will be extremely out and cause the engine to stal