I recently placed my original delivery valves back in place and pulled the 191's that I had in there. I got tired of that smoke. The problem I am having now is ever since I installed the 181's back in the truck idles really rough and misses until 2k and then smooths out. When the truck is revved up in nuetral it stumbles and belches some white smoke. i cant figure what I did to do this any ideas?

 

Assuming everything else is in good shape, and the hoses from the turbo are not leaking, heavy smoke with both the original and the larger delivery valves is generally due to slow timing. If your truck has not been timed, set it up to at least 13.5 degrees, and it will probably quit smoking and have a ton more power.