Hi guys Im new to this site and the mustang world. Bought a 91 gt and did a complete redo of the upper half of the motor. The car has 65k on the motor. here is the low down of the car. took it down to block and pistons.Installed a E303 cam,(yes I installed the dots cam at 6 and crank at 12), I put a new set of gt40X aluminum heads on,also put a gt40 upper and lower intake on(from a explorer),65mm throttle body from that intake,plugged the holes to the egr with high temp silicone bc deleting all the emissions on the motor, its got a bbk cold air intake with a 80mm MAS(calibrated to 24lb injectors which I also have installed in the car),roller tip rocker(1:6) from ford racing and a 1" spacer between the upper and lower intake.. Heres what I have the car wont come down from a high idle(1500) with the IAC hooked up. with it unhooked it will idle down then tends to surge and eventually die. I have a brand new 255lph fuel pump being installed in it as im writing this. I have a dyno and a tune set up for the car in 2 weeks but id like to have these problems fixed by then.The car doesn't idle for crap and has a major hesitation all the way through the gas. If I take it easy on the car it tends to be fine, but once I get after it, it hesitates very bad and tends to sound like a pinging in the motor. Any help with this will be GREATLY APPRECIATED!!!!! The car is timed at 14*. I have also moved the Air temp sensor to the intake bc the lower intake was not tapped for it so I read on here to place it in the intake which I have installed it so.