not working

I've replaced the sensors, distributors, cap, wires, plugs, cam sensor, crank sensor, as far as electrical goes. I don't know if the problem is electrical or not. When I try to start it it fires but will not start. The computer is fine, as far as I know, but I don't know if it might a rehab...

I have a 99 Suburban that has the push button 4X4 selector. the 4X4 does still engage but the orange light is never on. The orange selector lights currently do not work. it does not matter if its in 2hi, 4hi, 4low, or 4auto, the selector lights do not work. does anybody know how to fix it?

When I turn the heat on and raise the temp controllers to HOT, the fan motor blows air, but it NEVER gets hot. Not even warm... Any idea what can cause this? The engine temp runs around 190. Thanks in advance!