Matthew Parker

Ok, just bought this 2003 mustang V6 5 speed manual in Hawaii. Has the GT rims, hood, and trunk. However, when cold the car idles terrible, to the point of choking off a LOT. Runs great when warm. I've gotten the codes
P0102: Mass air flow circuit low input
P0193: fuel rail pressure sensor circuit high
P0113: air intake temp too high
It also is giving several malfunctions, including 02 sensor, evac, & misfire.

Also, if I turn the ac on that makes it worse, but only when cold, once the vehicle warms up the A/C works perfect. There was a recent addition of a K&N air filter system, which I know since K&N uses oiled filters can cause the MAF sensor code, but i don't think that is the cause of all this. Anyone got any idea what the issue is here?

For reference, there are new spark plugs and wires installed. Any inpuy would be greatly appreciated, much better than me guessing at which part is screwed and wasting money.