Tell you what... S-AFCII pissed me the fu** off when I first hooked it up. Took me like 2 weeks to get it right after stuttering the hell out of every parking lot and down everyhighway stretch!! I tried for just over a week and gave up and took it to auto solution and they gave me a base-line setting for my car for me to work with..... atleast I knew my engine wouldn't detonate from cruising!