g96v6-250k

Why does my eec-v run such a pig rich fuel trim that the cats slowly clog, the engine vibrates, horses are missing, and fuel mileage is ****. it cant get more than 20-22mpg highway babyed and if i wale on it, possibly as low as 8 mpg. When i got the car the damn thing could rip *** and still get 25-32mpg highway and there was no worry of vibration or clogged cats. Also i could damn near stay with the 5.0's and 4.6's.
Next question is why is it that when i clear the KAM, unplug the ECT the ACT and the fan and drive it performs like it did years ago and the above concerns do not exist. Has adaptive fuel trims gone stupid? "DEAD CPU? Cam angle? Ethenol? . If its learning a injector problem or something, why does'nt it lose horses/MPG and vibrate with these sensors unplugged? Does the eec NOT learn anything with these sensor faults present? Am im tricking the eec into a leaner trim? i try not to kick its *** with no ECT,ACT & fan but i have and no difference, it wont go pig rich and vibrate. i tested both sensors and they check normal to spec and no ground out. These problems started as the car sat overnight back in 08. i could feel it the moment i left the driveway next day. anyone with eec knowledge that has any ideas? I hate stinking up the air to stop the cats from plugging up. any suggestion appreciated. Oh i must add i have found 12v to ground but have fixed them. Did the eec fry or do i still have shorts to ground? I get a paranoid feeling these have a remote rf trim controled by the gmen and they want my horse dead.

g96v6-250k

figured it out. MASS AIR FLOW sensor failed yet worked.