heres the prob, installed vpc, put the injectors in, didn't know how to turn up and turn down fuel, fixed that, after car ran decent with EVERYTHING turned down, i have 550's vpc and walbro 255 high pressure pump, stock fuel pressure regulator and the MAP sensor is mounted on one of the bolts on the intake manifold (possible problem?) anyway, when the car is cold or has been stanfing for an hour, it starts fine, BUT, if it is shut off and try to restart it again, it doesn't idle UNLESS i jump start it (from a role and jump it in 1st or 2nd) then the prob goes away...? possibly Fuel pressure regulator? ok, so i took the 550's and put the 450's back in, still same problem?! what do you think it is...anyone? i'm guessing the fpr is screwed, the gain and the idle is turned all the way down on the vpc but the response is 3/4's way up, pulls but better with 550's... running 19psi. the MAP sensor is mounted upside down (the way it's supposed to be) but it is mounted on the actual engine not the firewall.... do you think thats the problem? lemme know, anyone, thanks!