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If you
Compression test
leak down test
swap injectors, check O-rings & fuel pressure
pressure test
swap ecu
pressure test
swap the maf
pressure test
check fuel pressure while engine is running & not running
install brand new copper NGK plugs heat range 7 BKR7ES iirc
check the battery grounds, engine ground cable, add a ground to the engine->chassis
Check the coil pack ground on the back of the engine
changed the cts
unplugged the O2
unplug the tps
These engines are among the simplest to diagnose in the world.
Fueling goes:
maf -> ecu -> injectors
Either you have the wrong maf (has it ever run properly in the past with that maf?)
Or the timing was set incorrectly (common mistake)
Or it has an obscure wiring issue, perhaps a bad cas or some bad cas wiring.
You need a wideband to see what is going on with the fueling
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