I couldnt tell you really...I just kinda played with it till I got it running. I turned it down until I got it sounding right and then adjusted it a little...drove around the house...adjusted it a little...drove around the house...so on and so forth lol. Now it doesnt die when I put it in gear and doesnt stutter when I give it gas. Gonna hit the road with it in just a few minutes and see if the acceleration is doing better. The timing was very close to TDC. I cant remember exactly if it was before or after...but its close to TDC.