I have an 89 mustang with stock block, stock heads, shorty headers, adjustable fp, typhoon upper and lower, cold air intake, 24# injectors, stock tb and 373 gears. I bought this car with the maf busted. I replaced it with c&l 76 mm with sensor calibrated for 24# injectors. It idle perfect when i installed it. It revs good when car is in neutral but looses alot of power once i put it shift into gear and run it down the road.

Should i need to reset the ecu? Or is the maf no good?
I bought the maf semi-new

 

Problem solved....maf sensor was in the incorrect maf housing.