Last weekend I had trouble with water in my fuel tank, so I started cleaning the fuel system and did some other checks while I was at it. The engine had developed a hesitation and sometimes backfiring. The fuel pressure was ok so did some further checking of the throttle switch and the AFM using the EFI Bible. The throttle switch checked out ok, but the temperature sensor in the AFM was measuring 4ohms. According to the manual is should be reading about 2500ohms at 20degreeC:disappoin As a tempo