I have no idea, it is just running rough, bad vibration and loss of power. I think I finally figured out the vacuum lines, I had one under the fuel return that was not hooked up and there was one on the idle control that wasn't hooked up. I hooked those two up, but it didn't have any change in how it is running. Here is everything I have tried, replaced with long block, new plugs, fuel pump and sending unit, MAF, idle control, new fuel injectors, cleaned the throttle body. All I can think of now. When I first started after the build, it ran like a sewing machine, smooth, plenty of power, but it has been going downhill since and getting worse. I also drained the gas tank and new fuel filter and clutch and all that stuff you would change when you have it as far apart as I had mine. I need help, nothing I do really makes it worse and for sure not better. I did try starting it last night with full throttle which I was told can check your fuel injectors from leaking and it did not even act like it wanted to start. I am a little confused on the Manifold fitting and then to engine. I have one that goes to my air breather box to the VDB, but I don't see it on the drawing