So.. ECU fried, and replaced with another.. same model. The car has a new AFM and hard wired fuel pump.

The car idles and starts fine. As soon as I rev it, it starts backfiring and struggles. You can gingerly drive it with a steady slowly increasing throttle to 50mph.

Any aggressive throttle thing go wrong.

Thoughts?

 

Confirmed you're running on both rotors? Checked for vacuum leaks?

 

could be a few things,... injectors clogged with debris, fouled spark plugs , fuel filter clogged , bad batch of fuel , vacuum leak ...
do you have A/F gauge ? does the mixture gets leaner ?

shop diagnostic > forum diagnostic

 

Thanks. I'll check a few of those. I can install an A/f gauge.. great idea

 

it happened to my turboII before , I had A/F ratio gauge , it will show "lean" (18-20:1) when I step on the gas,
coils ,TPS was working fine , I can't find the problem before I sold my car....
my car only happens when driving in rainy day , I think it was something about the ground wires , you can check the fuel pump resistor relay if you had one.

 

Great idea... I've read ground the injectors wires at the ecu . Also, the 2 stage fuel pump pressure.. I'm putting a gauge on it.

 

Pull your plugs and report back with the findings. One wet, one dry? Still betting you're running on one rotor.

 

They look fine, and compression checks out.

 

When I say you're probably running on one rotor, that doesn't necessarily mean no compression. may be missing fuel or spark which is why I asked you to pull the plugs. You should take some pics of them and post them.