Where to start? I put a new ford 302/345 horse b-cam motor in my '88 stang. I did the mass air flow conversion with all new Ford parts. 70mm maf calibrated for 30lb. injectors. Trick flow street heat upper and lower intake, 65mm egr plate and Throttle body, 30lb. injectors, ac eliminator, adjustable fuel pressure regulator set at 40lbs with vacuum hose off and plugged. Idle manually set at 900rpm and set the TPS to .98v. The motor runs great but when I start it after sitting all night it idles rough, between 600 and 1200 rpm. for about 3-4 minutes then idles fine at 900rpm. No vacuum leaks, egr checked good, new ECT and ACT. IAC cleaned and checked. Reading the plugs it seems to be running a little lean. One more question, if the computer takes over and adjust fuel itself, what good is the adjustable regulator? Anyway, your help and ideas are very welcome. Thanks