So just kidding on that 1990 454 SS bin, went to go put the Jet chip back in and noticed I had put it in backwards... it actually works now, holds idle at 1000 which means no more clutch foot braking...

I am looking for some guidance on tuning a chip for a modified 1989 C3500 with 454 TBI, TH400. For some background, I bought the truck in March and had a lot of work done including heads, cam and...

Hi, Austen here. Joined because I recently acquired an interest in tuning TBI chips thanks to some heavy modifications I made to my 89 C3500. Found a lot of great info on this site and hoping to...