Hey crew!
Just finished putting together my gmt400 with Vortec Heads and Summit 8000 cam. Runs pretty awesome except I have a little hiccup. When the truck is in motion and I floor it, the RPM will drop and there is a back fire through the intake. I just replaced all the plug wires, spark plugs, Vacuum lines and Distributor. My mechanic has said that the fuel pressure is OK. I also put in a brand new vortec pump. This was also a problem before a re did the top end. I data logged and the only thing that comes up that is concerning is that my MAT = -40 degrees. (Not even sure that I have a MAT sensor) Thanks for the help!
Just finished putting together my gmt400 with Vortec Heads and Summit 8000 cam. Runs pretty awesome except I have a little hiccup. When the truck is in motion and I floor it, the RPM will drop and there is a back fire through the intake. I just replaced all the plug wires, spark plugs, Vacuum lines and Distributor. My mechanic has said that the fuel pressure is OK. I also put in a brand new vortec pump. This was also a problem before a re did the top end. I data logged and the only thing that comes up that is concerning is that my MAT = -40 degrees. (Not even sure that I have a MAT sensor) Thanks for the help!