I wonder if you could "return" any of the equipment from the failed attempts to fix the problem?
Since nothing seems to work I'd like to "see" what your truck is driving like. The gryphon has the ability to record some of the PIDs you usually watch on the screen. The 5 I'd like to see are RPM, LOAD, MPH, APP and OSS.
These will tell me the speed your engine is working at, how hard your engine is working, how hard you are having to push your engine, how fast your going and OSS will just tell me what the "output shaft speed" is. All the OSS is usefull for is if it doesn't match the RPM relatively closely under certain conditions the transmission is slipping. The last one isn't necissary but since there was an opening might as well put something that might be usefull. Otherwise I would have went with MAF like Cody mentioned but since you've changed the cats and I dont have a 5.4 to compare to it wouldn't tell me much.
Since you only have 5 mins of driving go to a nice long street where you dont have to worry about people running up on you.
To pack the most information into one run (and one trip since the programmer only stores one log at a time) start with an agonizingly slow
and steady acceleration from 0-60 at 1 mph per second acceleration. Sounds easy but I recommend you keep a watch or clock on the dash to guage your foot off of. After that slow back down to a stop and floor the pedal till you hit 60+ (I went to 90 but I know not everyone can do that). For the last one do a regular acceleration that you use in traffic up to about 60 mph.
Or make it look like this graph:
http://forum.gopowerhungry.com/membe...datastream.jpg
If your not sure how to do it I have instructions just above my sig pic in the link "Gryphon data log instructions (The basics)".
Probably wont get anything usefull out of it but ya never know, something might pop up that nobody has though of yet.
