2002 jimmy sls 4x4 wont start parked it 12hr later wont start

When you cleaned the plugs, how did they look? Were they sooty and black or ahy and white? Could have a bad injector.

Try filling with fresh gas. Turn ignition to start.

Could be the servo on the front diff not activating. Could be a power prob or failed unit.

How do I remove transmission from 1996 GMC Jimmy.

Check the fuel pressure regulator. Pull the vacuum hose to see if it has fuel in it. If it does that is your problem.

There are doors in the plenum that open and close to redirect flow.There are vacuum and electric motors that control them or could be your switch.

yea you have no fuel and sound like a bad harness and the gm's are know for there fuel pump harness's! did you change it when you changed the pump? there is a lose connection somewhere in the fuel delivery system and it's pretty simply! i would check the fuel pump relay on the left hand side of the engine compartment and maybe even put power to the pump at the relay position "b" on the fuel pump relay harness and there should be a one pin connector to put power to also connected to the same position on the relay "b" the wire should be tan and white! good luck

Its your fuel pump,, mine did the same thing,,

have the transmission checked out, it sounds like its stuck between gears on the 4x4