Heahlight flase and truck will not run for more than 2 or 3 seconds

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chek out your heahlight relay may be its not working

new torque converter check fluids

Turn signal bulb is burned out most likely cause.

Mostly, there's something wrong with the wiring. Why don't you give it once 4 servicing and ask them itself???

Start the car and have some stand behind the vehicle while it is running in park and rev the engine to see if exhaust gases are coming out, if not sounds like the cat converter is clogged.

Hello. While it can sometimes be annoying, the flashing theft light is letting you know, and passers by, that the passive anti-theft system is armed. This system immobilizes the engine from starting unless a coded key, programmed to your vehicle, is used. When it's working properly it should flash about every 2 seconds. If it flases rapidly, or stays on, you will likely have to make a trip to the dealer. Also, if you have a keypad for your car some vehicles allow you to dis-arm the system. New vehicles come from the dealer with that system already activated.
I hope I've been helpful.

the light flashes whenever the system gets low on charge and compressor clutch cycles more than once every 5 seconds or so. so u have a leak

remove head light assembly, replace bulb and re-install

You can't reset it. It's flashing a code. If you tell me the code, I can tell you the proceedure to isolate the fault.

when you start up, there is an 8 second system test and the light is on during this period. Then it flashes out a 2-digit code. The first group of flashes is the first digit and then there is a pause before the second group of flashes which represent the second digit.

flash-flash-flash-pause-flash-flash-flash-flash-flash-flash = code 36

What code is your system flashing?