Re-post: Tune-up 2004 Ford Escape/Mazda Tribute

Sorry, but had to repost this one:
Anyone got any suggestions regarding a "tune up" for a lazy 2004 Ford Escape (Maverick in Europe) 2,3 litre (150 hp 4 cyl)?
Can a small electronic device (Module) inserted between one of the car's sensor and the ECU do the trick?
Lets say a 57 ohm (or 37) resistor "jumped" at the air-intake sensor??
Regards
J.E.L.
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