Pappyvtx

Hi All! My 01 2500HD 6.0ltr has developed an issue when it is idling, it starts to act like it is flooded. Rough idle, and when I push on the pedal, it will sputter and shake. If I floor the pedal and hold about 3-4000 rpm, it will eventually belch some smoke and and go back to normal idle. I replaced the MAF and that seemed to help a little, but it is back to doing it again. I am thinking the TPS? possibly? My CEL RARELY comes on with it and by the time I get my scanner hooked up, it is gone. I have not been able to get an actual code on it yet. Anyone have an issue like this? A possible solution? Thanks