[GREASEMONKEY]

Are you sure its getting fuel at startup? This kinda sounds like the same problem i was having. I also replaced the CTS, Swapped Injectors, Checked ECU, ETC.. I never did figure out the problem but i was thinking about the MAS being the problem.

This also only happened when it was really cold out, Eventually i could get it running but i had to pull the plugs and pour a little gas down the cylinders and it would fire right up.

Start out by finding out whats the main issue IE: Fuel, Spark, Air Intake / Vacuum leaks. Then it might be a little easier to narrow it down.

-Stephan