So my civic has a misfire, small ones when your lightly on the gas and majorly at high rpm, hesitating badly, sometimes occasionally hard to start. Really cant figure it out if anyone has ideas let me know!
Ok so as of now I have replaced the Fuel filter, Plugs, Wires, Cap and rotor, Coil tested good, tps tests good, map sensor is good, i have dsm 450cc injectors and resoldered all the connections and the resistor box is good, fuel pressure is at 34 idle and raises to 41 when you give it gas, main relay is good, changed the icm in the dist. Cannot figure out its just getting worse everyday.
My motor is a d16y8, boosted with a greddy tdo4h turbo, dsm 450cc injectors, fully tuned by pina motorsports. if anyone needs to know anymore ask.

 

You don't have a wideband in the car do you?

My guess, injectors/fuel pump is going bad and you're leaning out.

 

could be, im gonna look into a new pump soon. and no i dont have a wideband.