bill at hp tuner told me to delete 121 code by changing setting to 0 to 100 that fixed tranny problem(50$ GOESTO HP TUNER SINCE HE WOULDNT TAKE IT) NOW NOW .ITS STALLS WHEN COMES TO A STOP RANDOMLY.NOW HERE is the crazy part .stalls the only way it will start back is .1 i have to open drivers door (i guess is it will disconnect radio to eliminate 15min of staying on after truck cut off normal)2nd i have to take the key out of ignition and insert 4 times not turning ignition just in and out .fires right back up until its happens again .CRAZY OR WHAT.STILLING WILLING TO PAY FOR HELP .I BOUGHT HP TUNERS SO HERE ARE SOME LOGS

 

ALSO A GOOOD thing went to track friday .career best (thanks jamie p)1/8 mile time. its just keep shutting down it return lane.shame to have low 7 to high 6 sec truck and now have some kind of electrical problem.

 

check all your grounds

 

have check 3 wires from harness tie to block. the battery and i ran and extra from block to chassis . i have heard a clicking noise behind the cluster and my abs and brake light come on randomly

 

When it stalls do all the dash lights stay on as if the key is in the on position or does everything go out all together? If all the lights go out it could be possible ignition switch intermittent connection but normally I have seen that happen when hitting a bump or doing something to jostle the key......

 

they come when its stall .but i have hit a bump and it come to an idle stay there til i try to accelerate then is stalls. also i forget to mention .on start up my S.E.S dont always come on. it will still start up will out light on.but if is stalls and and i do the key thing its comes every time after stall out .

 

Have you checked the ignition switch in the steering column? Mine crapped out on me and that $14 part cost me $900 in transmission repairs. That sucker regulates the voltage going to a lot of stuff and the problems your having with your gauges is a tell tale sign of one going **** up. Its not the key tumbler but the switch on the opposite side.

This: http://www.carparts.com/details/GMC/...1-023c92f63ed1

 

I had one like that. It ended up being the throttlebody

 

change throttle body 3 times . i just ordered ignition harnress see if i locate this switch

 

Replaced alot of throttlebody connectors also