Hi am new to this forum, but glad to have found it. I have a 1992 c2500 350 small block 2wd, for the past few months my truck has been idling extremely low usualy just above 100rpm after it has warmed up, and when I am cruising doesnt matter at what speed if i give it gas to about 2.5k rpm it starts to back fire through the throttle body and starts hammering like its not getting any fuel, have changed out the O2 sensor, fuel filter had the fuel pump checked, checked all vacuum lines, replaced the EGR valve, the pattern for the injects or the TBI look good, so any suggestions would be greatly appreciated

 

Check the idle air control and the timing.

 

Will check out the idle air control, but for the timing someone tried to say there was some wire i had to disconnect before i set my timing, any advice on where i can find that wire?

 

passenger side on the firewall. theres the black box. its in their. cant remember wire color or stripe color, but its in there.