HI I have 02 Tahoe 70000 mile 5.3 No service engine light works great but as soon I rebuilt my transmission I went got my truck from shop went to home now doesn't start I check fuel press is ok but as soon I start the engine slowly the fuel press Gage comes down and shut off the engine but when I bleed the gas from the press Gage the pressure goes up and truck works ok please can you help?

 

So, to get this straight, when you start up, you have pressure but then when it starts, the pressure drops and the engine stalls? I don't understand " bleed the gas from the press Gage the pressure goes up and truck works ok".
When you try to start, the BCM gives the fuel pump relay an on command for a couple of seconds to pressurize the fuel system and shuts off the command. When the engine starts, it uses this residual pressure to run UNTIL the oil pressure switch turns on and then energizes the fuel pump relay to keep fuel pressure to keep the engine running. I wonder if you have a bad connection on the oil pressure switch or a bad oil pressure switch. No telling what was disturbed when the transmission was rebuilt.

 

I just found out fuel pump is bad I replaced works perfect now but any chance if oyu know why my A/C blower fan docent blow from front vents? this happen after disconnecting battery terminals maybe need to be calibration? and how?

 

Out of all the gens of the suburban the fuel pumps need to be replaced by or around 100k.
As for fan disconnect battery again and reconnect see if that works. Might have to replace fuse, or just drive it awhile.

 

I disconect battery and check fuse and drive didnt fixed I will try again