need some help with install

jus recently installed
PRC stage 2.5 5.3L heads
PRC dual valve springs
MS3 113+1 LSA
Chromemoly pushrods
LS2 timing chain
LS6 oil pump
Pace setter LT
ORY
SLP lid
mail order tune from texas speed

when i take it too 5500 rpms and have to slow down sometimes it will drop rpms to 400-500 and almost die but sometimes it wont and when it is running good it will be at 1000-1200 for idle is this right??? it is running extremly rich it burns the eyes its so rich!!! i have had the computer tuned. i still get a SES code of P0106 and have found no vacuum leaks can anyone shed some light on to what my idle problem could be??? i just cant figure this one out

your problem is the mail order tune. I would suggest you find a shop to dyno tune it or someone that has hptuner. Mail order tunes are just good for bolt on cars and to get cars like your to the tuners.

You can always go with Frost. He does great tunes!