there is a guide on here.someone put up the link in your other thread. you could take it to an auto electrician if you want. if you dont have a digi multi-meter thing that tells you what volts the maf has that would be easier. this will make a hell of a difference when earthed. the auto sparky can tell you what its doing now and what its at when its re-earthed, so if the car still isnt right you can cross that off the list. i had this problem and my mate earthed it without being sure on the voltage/earthing, but its done the job, and i will take it to an auto sparky when i can be bothered!