Ragz89

Hello New to this site. Have a troubling question.

I have an 89 GT with upper n lower trick flow intake 351 alum. heads, custom ground cam, crane cam 6-hi ignition, and distributor. c&L cold air matched to 30lbs. injectors, 75mm throttle body, spacer, mass air flow sensor. chip,..

ok now the fun part lol, It starts up runs great. after 3-5 mins idle drops starts to stutter and stumble, I rev-motor to keep a constant Rpm for 30 sec. to 1 min. idle corrects itself and runns great. turn off and re-start after a few mins. same thing happens.

any help would be great