thanks I will check that next

 

What one is the speed sensor the one tail shaft or the one over the pan

 

VSS is in the tail shaft, the RWAL sensor is on top of the rear diff. What is the problem you are having ?

 

Changed the o2 output speedsensor cat isnt clogged also changed plugs wires cap rotor the transmission doesnt slip and fluid looks healthy but when I got up steep hills of any kind just drops in power runs high rpms just gets gut less quick oh its 1998 5.2 and fuel pressure is fine when just sitting at idle

 

Well if the AC is changing vents, you have a vacuum leak.

 

It when going up hill at high speeds it looses all power the a/c vents close I am not ruling out a vacuum problem I just wondering anything that could cause it to loose power like that and causes the power loss to start

 

Previous owner already replace cat before I got my truck. Since it appears that all of these have or will have the plenum gasket blow, I decided to do the kegger mod before I have problems. Engine ran fine before (other than inability to shift into 3rd). Since cat was clogged, I am sure the plenum is blown.



So started on this project today. Thankfully, the various threads on this forum provide tons of helpful info. Thanks!