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You need to find a OBD-2 scanner and read out your diagnostic codes. If the CEL came on, you will have one or more stored codes. These will help greatly with the diagnosis.
MAF = mass airflow sensor. It's in the intake tube between the air filter and the throttle body. Clean it with spray electronics cleaner if you can't find MAF cleaner.
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2003 F150XL 4.2 short cab/bed 4x2 5 speed manual 3.55 LS
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