I have a 2005 gto a4 with a 236/238 601/602 lift cam, trick flow heads, headers ,etc. The car has been dyno tuned and runs well. When I first crank the car it starts and idles good, but if I shut it off at a gas station etc. I have to give the car some throttle for it to restart and catch idle, what do I need to adjust to fix this problem? thanks.