I recently bought a 2000 Mustang Gt. It has a bunch of aftermarket work done to it already. Stage 2 clutch, stage 3 cams, x pipes to MagnaFlow, cold air intake, upper and lower intake plenum, 410 gears. Now the car starts and idles fine. However a few minutes into idling it will start to idle rough and bog down then Rev and bog down then die or continue to do the reving. I've replaced the tps sensor already and I've reset the computer. The issue is still happening. Now mind you its only as the car warms up. Once the temperature gauge shows its at temp the issue goes away and it idles fine. Idk where to go from here and I'm a bit lost as to what to do for this issue.

 

It's a 4.6 liter v8.

 

Idle air control valve perhaps.

 

That was soemthing I intended to look at tomorrow. I was planning to try and clean my maf sensor as well. I won't know if that fixes it until after.