This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and hence not compensated for and can thin the engine out and can after that allow the engine to rev going on similar to not desired causing harsh running. As its a mechanical deformity it tends not to slant upon the malformation spacious and you can sometimes hear a hissing noise as soon as the engine running.
Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me say you a little more approximately the burden history. It currently has a master tech approved idle freshen control valve and tps installed. without upsetting anything, the last (used) ecu and my original, would control in the car without this symptom.
I'm reviewing your question now, and will state help like your reply ASAP. Rgds Greg. What malfunction codes attain you have. Does the engine run as soon as the MAF disconnected. considering the loud hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF similar it is lonely measuring the air that is getting in imitation of the MAF, as a result if the intake manifold is sucking in freshen the air to fuel ratio will be extremely out and cause the engine to stal