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MAF is one of the key inputs the ECM uses in fuel & ignition strategies and should be repaired ASAP, though it would seem highly doubtful that is what is causing the problem with the Scangauge. When I encounter a vehicle with odd electronic issues, the first place I go in diagnostics is to ensure that there is no AC voltage bleed from the alternator. AC voltage makes DC electronics go nutty. Connect a DVOM set on the AC scale to the battery and check the voltage with the engine running. Anything over .02 volts AC is suspect.
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