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Rough Idle ? hesitation 3000-4000rpm ? Items to check
Just to post two more items to check if you have the above problem :

*) Inlet Temperature Sensor

*) MAF Sensor

Why ?

Just had a new contact-less ETM fitted, and still had rough idle to the point of it stalling and hesitation 3000-4000rpm.....

Found two faults that my air inlet temperature was reading -40 degree's (was a broken cable to the sensor)

My MAF sensor was faulty, only replacement is the BOSH one, performance is excellent now (better than when I bought it 5 years ago) and its so smooth on tickover and acceleration.....