Don't want to sound like a broken record but I have done a bit of searching old threads regarding this problem of hesitation in low revs while touching the throttle and there seems to be a few pointers such as the pipes to the manifold, MAF sensor & Lambda sensor.

I've found a few tips on checking the lamda sensor but from a few threads I'd be worried about the MAF sensor. Is there a few precautions I should take, what cleaner to use, things I SOULDN'T touch. If anyone has bought one recently, how much did it set you back?

Much appreciated in advance

Johny