My USDM Oddy 97 had an a jdm stock f22b6 engine swap. Ever since it's runs rough. Starts but usually not the first time I crank (esp when cold). Runs fine when cold but after warming has rough idle. Can tell it's running rich cause you could get high on the exhaust fumes. Car seems to run fine on highway though giving bad mileage.

I've changed everything. Sparks, dizzy, wires, TB (to a USDM one)

ECU and Harness still stock USDM. Was told that I need to replace injectors to USDM ones cause JDM ones have different cc and flow rates? Is there any truth in this? I do notice that removing the plug on first cylindor does not make much difference in rpms (though there is spark and pulse too). Also compression is 180 on all 4 cylinders.

Any other ideas?

 

timing? valve gap?