Wont start 1996 tahoe 1500

That sounds like your timing belt.

The 1990's chevy trucks(all of them) had fuel pump and grounding problems:

1. Check the fuel pump ground strap next to the gas tank as it could be broken from the connector or just loose.

2. Have a fuel pressure test done on the fuel lines at the engine top. (Note: if there isn't enough fuel pressure, replace the fuel pump.)

Vortec motor? 5.7 ? if so, likely fuel hoses to injector leaking fuel within intake causing lost of prime pressure and fluding engine with fuel

Sounds like it could be a dirty or faulty idle air control valve.Take it off and clean it with a wire brush and a non-chlronated brake cleaner or replace it with a new one.Make sure you reset the computer after cleaning or replacing the valve.

I have had this problem on my 89 and my 94 gm trucks what it was is the pick up inside the distributor time to rebuild it (not the cap and rotor) the little thing inside with all the wire wrapped around something- copper wire with a clear coating on it the coating get hot and cracks causeing it to ground out when the vehicle warms up run ok until u shut it off then no start or runs rough

Do you have a security light flashing? Sound like a theft system problem. Some 1996 Tahoes had passlock.

check your rear brake shoes if you had them changed recently they may not have been adjusted properly and that sometimes will cause that and also check the rear diff yoke where the driveshaft goes insometimes it get gear oil on it and harder for it turn. i would try these hints first before i take to shop

your fuel injection system isn't holding residual pressure.  The valve in the fuel pump that holds the pressure is defective.

idle air control valve is slow or clean our air intake thank you Pierre