I have a 92 Mustang Gt 5.0L that gets 23 mpg on the highway after installing a 70mm throttle body and a 76mm MAF. It got 26 mpg on the highway in stock form. But now for some reason the mileage has went to crap!!!! I've used almost a half a tank of gas and I've only went 86 miles and 45 of those miles were highway miles.
The engine has a new ignition pickup (installed for another reason, not because of gas mileage), platinum plugs not too many miles ago (maybe 2000 at the most) along with cap and rotor. I also cleaned the Mass Air Flow Sensor Wire.
My question is this....will the Idle Air Control cause bad gas mileage if it's malfunctioning? This is the only other thing I can think of that might cause this problem. What do you guys think? Is there another possibility I'm missing???
The engine has a new ignition pickup (installed for another reason, not because of gas mileage), platinum plugs not too many miles ago (maybe 2000 at the most) along with cap and rotor. I also cleaned the Mass Air Flow Sensor Wire.
My question is this....will the Idle Air Control cause bad gas mileage if it's malfunctioning? This is the only other thing I can think of that might cause this problem. What do you guys think? Is there another possibility I'm missing???