04 6.0 misses at warm idle and tries to die

[metalmulishamunky]

2004 6.0, EGR cooler delete, new EGR valve, new fuel pump and #1 injector. I've had my truck since oct. and it started surging about a week after I bought it. It has a hard surge during acceleration when cold and it gets a little better as the truck warms up, however the last little while it's developed a "Hard Idle". It will randomly miss during Idle while it's warm and last night it tried to die. I just had the fuel pump and #1 inj. replaced about 2 weeks ago and the EGR stuff was done in Nov. Any Ideas???? I'm not getting any smoke other than white on startup in the mornings but it's about 20-30 degrees and it quits after the truck warms up for a minute or two. And when I had it tested for the surge, we drove it about 30mi with the scanner hooked up to it and it showed 100% performance out of everything yet was surging the whole time and threw no codes. any help would be appreciated!!!
thanks