91ls1silverado

I have a LS1 rebuilt with cam and its in my 91 c1500. I put about 3 feet of piping after the headers so i won't mess up the o2 sensors. Well i drive it around and when i barely step on the gas it like stutters and it sounds weak until i lay the hammer down and it runs good, i thought it was misfiring but nope the scanner reads everything good..all the spark plug wires are on good and oil pressure is good....it does say that the fuel trim learn is disabled...idk what that means can anyone help its starting to be a pain in the butt...and it doesn't smoke neither...pleaae help....it has a mail order tune as well with a refurbished computer.

joecar

You need a tune for the cam you mentioned in your other thread.

91ls1silverado

I got a mail order tune for that cam...but ill talk to the guy tomorrow...its running way to rich...