Starts and dies shortly after

Aloha,

I have a 95’ Tacoma with an 03’ motor 2.7 4x4. When I turn key, it starts and dies 5 seconds later. When I try to give it gas, it hesitates, sounds like when I press gas can’t hear my intake pulling air into engine. After a week of sitting my new battery is dead. Don’t know what it could be I’m thinking engine harness? Any input would helpful at this point

things I’ve changed:
-Fuel pump/filter/injectors
-Spark plugs/coil packs
-maf/crankshaft/camshaft/throttle position sensors
-new throttle body
-All new vacuum lines
-idle air control valve/PCV
-starter relay/open circuit relay
-fuses (engine bay/interior)
-3 different ECU
-clutch

 

Codes?

I had similar issue
Replaced coolant temp sensor
Replaced 7months B4
The new CTS fixed the issue

 

Not sure, the previous owner did the motor swap and converted the original 95’ harness to a 03’ harness & OBD port doesn’t work. Replaced coolant temp sensor on the back of the engine. Still same. Just about everything sensor wise under the hood was switched out.

 

Saw this video yesterday. Not a Tacoma, but matches your symptoms so perhaps relevant.

https://www.youtube.com/watch?v=xqYCwKcF8c0