My 99 suburban has the 7.4 kit in it. It seems to be runnin lean. Runs good when you stand on it but otherwise not so good. The guy I bought it from had pressure washed the engine and I think maybe the Fuel Management Controller got wet. Sometimes when you first start it, it will run good for a little while but then starts missing. Am I on the right track? Where can I find one? Is it still available?

I have the same problem with my 01 silverado 6.0. Been trying to find a way to get my fuel psi a little higher. Running 59-60 psi under full throttle but should be at the 61 or above. When i get my air/fuel ratio guage put in we'll see what it's really doing.