6nz slight miss

I just did a platinum rebuild on my 6nz. Installed a marine cam and 7" straights. Other than that, the truck is stock. Everything seems to run fine at idle. Under load, it seems to have a slight miss that sometimes goes away. It doesn't smoke, no dummy lights. Also, with the new pipes I feel like I can hear one cylinder popping off over the others, almost like the jake brake at low speed but I'm standing on the throttle. I'm at the point that I can't tell if I'm engineering problems in my head or if there really is an issue. The motor was so worn out when I bought the truck that it ran like crap anyway, so I don't have a real before and after to compare it to. Help!

 

Well, I've had the overheads run twice. From all the research I could find, the valves should have been set to the same spec, regardless of the cam. Unless I'm wrong on that. But then why would it go away?

 

You mean that they have to be set any time an injector is replaced the codes have to be set?

 

I appreciate any help I can get buddy. I wish I knew a lot more than I do, too.

 

Which harness are you referring to? I bought a new fuel injector harness but I haven't put it on yet. Is there another one I should worry about?