This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and therefore not compensated for and can lean the engine out and can moreover permit the engine to rev stirring in imitation of not desired causing gruff running. As its a mechanical deviation it tends not to direction upon the irregularity roomy and you can sometimes listen a hissing noise bearing in mind the engine running.
I did re-check them tho. The master tech did extensive tests on the let breathe flow meter and said it was good. in the same way as I unplug it and manage the motor, the car runs aggressive and at 850ish. I can single-handedly guess that my supplementary rebuilt ecu has an issue, or the tps needs to be re-adjusted, or somehow my maf has died in the midst of all this. I don't think the tps has that much govern in the oscillate of rpm though? I think it solitary adjusts it a propos 1k..
This could be a large vacuum leak ,with the MAF connected it is forlorn measuring the ventilate that is getting taking into account the MAF, fittingly if the intake manifold is sucking in air the let breathe to fuel ratio will be categorically out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. behind carb cleaner vaporizer vaporizer in the area of the hissing afterward the engine direction and taking into consideration you hear the engine stall or rev difficult there is the leak ,could be a bad vacuum hose bad gasket on the manifold.