05 GTO Questions

Tuning this 1969 Camaro with a 2005 GTO engine and auto trans. Engine has a larger cam and headers otherwise its stock. Im having a couple issues I was hoping to get some info on..

First.. This problem is way worse when cold. The log attached is when its warm. I will explain what it does warm. When you crank it it fires up like it should runs like it should for a couple of seconds then stumbles, actually I would say its more of a cutout then a stumble.(when hot) or will die(sometimes when hot, always when cold) When its cold it will not start unless i depress the accel pedal. I have tried to increase the startup airflow and it doesnt seems to ever go above 20% ETC at key on.

Second. If I slowly depress the accel pedal around 4% it makes the ETC go backwards and the engine will stumble and die. It does this until 6% then is fine.

Any help or info would be great. Thanks

Ttt