Why would my truck lose power while driving and not start ?

If you're going to do nonsense like running without O2 sensors and hacking things up before testing anything then you should see a mechanic . The timing chain may be worn , that's why you test things , turning over is cranking , it turns over but doesn't start . No telling what else you have botched up .

This vehicle is 24 years old and has obviously seen much better days! Time to junk it and move on! It's not worth fixing! Jim

Candice, You must be a government employee.

Why would you continue to drive a vehicle with no 2nd or 3rd gears. Your “gamin” on it has most likely caused it to jump time , and yes it will try to start with timing off probably trying to and BACKFIREING … RIGHT? HONESTLY you don’t need a viechle , and lack a lot being a mechanic.

What ? Are u 2 years old.

No 2nd or 3rd gear so your solution is to push the vehicle. Now no start , I suggest you push it harder. You need to fix things as they go bad not continue driving a5 all cost . You don’t need a veichle.