08 Lite engine problems

[Winfa]

2008 Venture Lite not running very good. Idle screw makes no difference. only idles at 1200 when hot. Often dies when coming off idle. bogs at full throttle. generally runs pretty good throughout the middle rpms. New plugs. New exhaust. New gas. New TPS. No codes. Usually starts pretty good. Runs 2800 when cold then drops to 2200. When warm drops to 11-1200 and often dies. As mentioned, the idle screw makes no difference. turned in as far as it will go. Tried syncing throttle bodies with vacuum gauges but the adjustment screws seemed to make no difference there either. Open to suggestions

 

[74Nitro]

Do a leak down or compression test to verify engine is healthy.
Then check fuel pressure while running.