i just finish installing my turbo and doin a dpfi to mpfi convert, having problem with reving over 3k and getting code 4, and im using smc to manage my fuel , the wierd thing is that, when i didn't hook up the SMC i can't rev over 3k but when i installed the SMC it can reach up to 5k but that was the max it can go to, and not getting the code 4 when i installed the smc. any advice or help would be great , thank- RC