Is there any diesel mechanics on here who know much about maf sensors and rough idling problems? Basically my car idles rough when the weather is warm, fine when it's cold and everything points to a maf sensor problem, unplug the sensor and it goes normal. Tried a new sensor and it's worse. It's had the throttle body and egr and loads of other stuff inside cleaned by my mate. When it idles rough there's an exhaust smell in the car, decrease in fuel consumption and sometimes juddery to pull away.
Any ideas? Cheers