car dying

[foxbody1989]

ok i have a 1989 5.0 sometimes while cruising in neutral or while in reverse and i take my foot off the gas she likes to die any suggestions?
bbk cold air,edlebrock performer lower, pro products upper, tfs1 cam, mac long tubes, gt40 motor,gt40p heads

 

[HISSIN50]

Have you pulled codes?

 

[foxbody1989]

well

well no i guess i give it a try