Stalling and idle issues

[Carolina GT fan]

I have an 08 mustang GT that has been modified with a e force blower, thumper cams and of course an aftermarket tune. The problem is when I am coming to a stop light the idle will go down to around 200 rpms then rev itself up to around 1300 or so. This will repeat until it either stalls or finally levels out. I thought it was the TPS and I changed that but the problem is still there. It seems to happen less on a warm day or when I have been driving for quite some time. The only thing I can think of now is the throttle body motor would be causing this. If anyone has some ideas it would be great to help me keep from tearing out what is left of my hair.

Thanks,
Jason

 

[racerraj]

Throttle body motor can cause that. A vacuum leak can too. Bad tune as well. Was it running well with the tune you have and just stopped running well without any changes?

 

[Red_LX]

Who did your tune?

 

[Carolina GT fan]

Turns out it was a dirty MAF sensor. I got so tunneled on the TPS I never thought of it