Bumpety bump bump... [copied from other post]
As the originator of this thread, I tought I'd post an update.
Today I fitted a new MAF
What a difference.
Cleaning may provide a minor but shortlived improvement but if your using your car daily the deterioration will be gradual and you won't really notice.
What promted me to change it was my really bad fuel consumption, I was struggling to break the 50mpg barrier, so something was really really wrong.
Fitted the exchange unit in the car park of my local dealer and the difference is incredible.
MY ADVICE NOW IS TO BITE THE BULLET AND SIMPLY REPLACE IT, DON'T BOTHER CLEANING IT, JUST CHANGE IT. IF YOU GET THE FLAT SPOT / YOU THINK YOUR PERFORMANCE ISN'T WHAT IT SHOULD BE / YOUR MPG HAS DROPPED. GET THE CAR READ FOR FAULTS, IF NONE SHOWN (MINE DIDN'T HAVE ANY) AND YOU HAVE THE SYMPTOMS I'VE JUST DESCRIBED THEN CHANGE YOUR MAF.