2003 Chevrolet Silverado 1500 Questions

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My truck seems to only start when it feels like it, lately it will start after about 5 to 10 tries. Any advice which part it could be?
My running lights on my 2003 Chevrolet Silverado 1500 LS work but when i press on the brakes only one gets brighter.
2003 chevy silverado 1500 4.8 V-8 LT no start no crank new battery new starter power to starter not solenoid
Exhaust and starter was damaged from hurricane harvey.

Brand new catalytic converters.
4 new O2 sensors.
New starter.

Ran great for 3 weeks.
Sat for 2 days then wouldn't start.

Fuel system good.
Getting good spark before distributor.
New rotor on distributor.

Still won't start.

died. tried to start and would start for about 2 seconds then die. Now will not start at all. Just cranks nd still nothing on the dash.
2003 will not shift to 2 or 3 gears
Never had a problem before i was told it needs to be coded
where is the oil pressure sensor located on the engine
He is providing all parts, fluids and a garage. I'm using my own tools, traveling about 20 miles (one way) to his house and doing all labor including paying a friend 100 dollars to help. What would a fair price be. Any thoughts? It's a 4x4 too.
I have an 03 chevy Z71 that the 4wd doesn't work the light stays on 2wd just put a new achuator in the front end and till says service 4wd help.
ran fine this AM, stopped at store, came out 15 mins later and get check engine with reduced engine power. Truck was running and able to get home, but ran at a little above idle RPM and no ability to accelerate. Checked air intake and that had a nest of some sort in it. Cleaned that out and no effect on check engine. Could it be a fuel problem, fuel filter?
truck died while driving seemed out of gas. replaced fuel pump and filter. has spark still no start
the truck has stardard non chip key, codes dont work , mechanic replaced wires in key chamber.
4.3 motor 179,000 miles. Can you give me several different reasons why my gas gauge is not working. Thanks a million. MT
When I accelerate the engine revs before I get to 40mph and when I turn slowly the truck just dies out ...pls help ..thnkz
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