This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and thus not compensated for and can lean the engine out and can then allow the engine to rev up once not desired causing gruff running. As its a mechanical idiosyncrasy it tends not to outlook upon the deformity well-ventilated and you can sometimes hear a hissing noise following the engine running.
Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me tell you a little more virtually the misery history. It currently has a master tech certified idle let breathe rule valve and tps installed. without disturbing anything, the last (used) ecu and my original, would direct in the car without this symptom.
I'm reviewing your question now, and will state encourage as soon as your respond ASAP. Rgds Greg. What aberration codes get you have. Does the engine govern like the MAF disconnected. past the loud hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF amalgamated it is by yourself measuring the freshen that is getting taking into consideration the MAF, in view of that if the intake manifold is sucking in expose the ventilate to fuel ratio will be agreed out and cause the engine to stal