Rough Running Dually

[Chevy3+3]

Not doubting your abilities but after thinking about it make dang sure you have the firing order correct and your wires in the right location. Another thing to remember is to disconnect the computer wire on firewall going to distributer when checking your initial timing. If you check you timing or try to adjust distributed while running the computer will correct it and throw everything off.

When I bought my dually with 454 everyone said that the factory set 454 tbi at 0 degrees on the initial timing (with wire unplugged). Alot of people said that if I wanted it to rum better to advance my initial timing to 4-8 degrees it would wake it up some. I advanced to 5-6 degrees and made a noticeable difference in how she ran. Be careful not to go to far. Of you do it could cause pinging and your knock sensor will pick it up and retard the timing and reverse what you just did.

But double check your firing order and then double check your initial timing