Tramminc

Can someone look at this tune and tell me why when I do a cold start I have to keep my foot on the peddle at 1200 -1300 RPMS until it warms up to 120 degrees. than it will hold idle of 900rpm. Car is SD tuned, no 02 sensors.
C5R block
Callies dragon slayer 4.0" crank
Comp star rods (made by Callies)
Weseco pistons -8 cc
ETP 225cc heads , ported to 232cc by WCCH 2.12 intake 1,94 exhaust valves, .700" lift valve springs
Cam 255/257 .624/.624 lift on 111 +4
Super Victor intake
105mm TB with custom elbow
Stock rockers
LS7 lifters
ported oil pump
dual roller timing chain

Fuel
255L intank pump
60lb injectors
custome feed/return lines with regulator

Tranny
FLT level 6 with hardened input/output shafts
Yank SS3600 stall
SFI flexplate