AE86 4age engine not starts crank ok backfires to air intake

[Ryo]

Finally today after 3 hours fighting the AE86 is running again.

I have checked timing belt all was within the marks after that i cleaned spark plugs, checked distributor cap, cables, checked cold start injector, checked AFM, cranked the engine checked plugs but they have been clean so i have aimed at injectors after disconnecting first i measured voltage on it my friend tried to start the engine and it started. I have connected it tried measuring the second one connecting the first and it started as well but as i saw no fuel on the plugs and looking at the gauge the car was nearly out of fuel so we put 10L in the tank and tried again with all connected and the car started to run. I have in addition adjusted the timing with the light gun now it looks that everything running. Still i see that insulators on the fuel injectors have damaged rubber seals i must replace that but there is no fuel leakage. And yes i made diagnostics also but there was no error code comming.

Now i must go back to my AE86 after winter the car starts but when i hit the gas pedal the engine shakes and hesitates to run smoothly like running on 3 cylinders i checked distributor, cables cleaned plugs checked timing with the light gun all is in order but i must still look for error codes from diagnostics. Is the diagnostics connector on 85 zenki model on the back of the air inake or by the AFM as i see two yellow round connectors with two cables by the AFM is the one without plug female with thick white and red/blue striped wires and back of the air intake there is one with the plug with not so thick wires right by the fat connector as well plugged. If there will be not error code what issue i might be looking for? Thank you for all your help