We have a 1990 F150 with a 5.8 L engine, 4x4, 4:10 gears, 4 inch lift, auto trans, 33x15 tires, cat back exhaust, and 53,000 original miles. It has been mostly a driveway decoration for most of the time, but we do use it to tow a trailer.
We're finally getting around to considering a new eecu chip, and whatever else that might help with power and gas efficiency. We're not well informed about these modifications, could anyone fill us in??
thanks.

 

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