1994 factory b16 del sol, was having issues with one injector going bad... turns out I was given a set of 3 peak-hold injectors and one correct injector when I bought new ones which caused the issue and probably fried that ecu. So I replaced the injectors (made sure they were correct this time) and got a new ecu at the same time.

Now the car runs fine for about 4 seconds at a time, idling great at 2000+ rpm with a single misfire here or there but then stumbling back to barely running. The car stumbles bad and misfires horrendously under any throttle and is hard to start until the 2000+ idle kicks in, will not build rpm with throttle. This repeats over and over.

Fuel pressure is where it should be until the car stumbles, then it goes up a few psi which tells me the issue is the car pulling fuel. The injectors are clicking.

Covering up the two sensor holes right in front of the butterfly seems to help but it still won't take throttle doing so.

I have no clue what to check. The car ran and drove fine before all of this as long as the one injector wasn't fried so I don't suspect any bad sensors or compression issue. Maybe the ecu I bought is bad too? Where should I look next?

 

Videos here: https://drive.google.com/drive/folde...4kRoCZUp2VWlNr

 

Did you even try your old ecu? The first 2 things that come to mind are the tps and map sensor, could check your tps sensor calibration with a multimeter. Makes me think possibly the sensor is broken which would be odd but you never know or the map sensor is acting up. Both can cause the similar issue without throwing a CEL.
Your video shows it stumbling bad when the idle starts getting really low trying to keep itself alive so that's why I'm kinda thinking it "could" be 1 of those sensors.
I don't quite understand your meaning when you say you had a bad injector but then noticed 3 of them were the wrong ones so you replaced them all again for the correct style. What made you replace them in the first place? Did you have the same problem before replacing any of the injectors?

 

Car is a del sol from Florida, old ecu was bad from water damage and it sat for years with bad gas so I replaced the entire fuel system