Just got done installing one of these systems on a customers car. There is very little information out there on the tuning side, you kinda have to fumble through it. Hook up a fuel pressure gauge and check the fuel pressure. The regulator that came with the tanks unit (albeit for a chevy) was junk and could not bypass enough fuel. It needs to see a pretty consistent 50-60psi (58psi is spec.). What is your IAC Step's at warm idle?