Up for sale is a Good working Used Isuzu AMM / MAF. Fits many 4 cyl 90 91 92 Isuzu models, perhaps more - very hard to find unit! AFH45-8 / 8 94332 6820  -- Match this number with your original.  You will find this sensor mounted just behind your air box.

The mass sir flow sensor is the heart of the cars fuel injection system.  If it's not working properly, it can cause a whole host of drivability problems, including no start, stalling, runs but hesitates, has no power, lean running (which can cause overheating), rich running, etc.  The mass air flow meter needs to work RIGHT.