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Got case learn to work...problem fixed.

Switched cyl 8 injector to cyl 4 and 8 is still missing. Going to check cats next or light van on fire.

40118

Did compression on the 2 bad cylinders and 1 good. Tested with rest of the plugs in and throttle open, all checked about 180 lb. I did notice that it started to crank kind of slow, but I think a weak...

Ok, I looked for the fuel regulator and it appears to be a non return fuel system. I swapped coils and the same cylinders misfire. Checked a ground on the back of the block and fuse box.

I have...

10 SS, thanks for the idea. I will check it out tomorrow. All the plugs did look very equal?

I haven't logged the trims yet, but will try that tomorrow also. I think I did a while back and they...

I have a 2004 GMC Savana 3500 with the 6.0. I have been having a random misfire problem with only the p0300 code. At first I didn't notice any rough running, but now it is noticeable at idle. The...