May need tuning for Cams?

[bigred97f150]

Hey guys I'm new to the forums and I've got more of an inconvenience than a problem. I recently bought a 2000 f150 5.4l with 212,000 miles on it. The motor was perfectly fine but I had parts laying around and a short block built that I wanted to use. Long story short the short block had problems apparently and broke a rod so it came back out and ended up rebuilding original motor. Anyway I replaced the cams with these http://www.summitracing.com/parts/CCA-102200/
and installed obx stainless longtube headers. I'm also running maggy 94106 high flow cats and 2 1/2 true duals no mufflers. The truck seems to run fine other than when you try to start and take off with it cold. When I start the truck cold it revs up to about 1200 or so then dies sometimes and sometimes it will catch itself and not die. Every time I start it cold, though, it will usually die when put in drive or reverse if I don't give it gas immediately. As you can imagine that can be inconvenient of I'm in a tight space. When the truck is warm is starts fine and doesn't die when put in gear. Also it hasn't ever died at a stop sign or light and seems to run ok when warm. It idles at about 650rpms when in gear and kind of surges between 800 and 900 rpms when at idle in park. My question is do I need tunes to help the computer with the cams?

Sorry for the long post just wanted to give plenty of information.
Also it is throwing no codes right now.

Thanks,
Hill