After installing an aftermarket ecu i get random misfires. No particular rpm or load. The ecu-settings is correct, so it has to be something else. How do i start finding out whats wrong? The car is going on the dyno tomorrow, so i have to fix it by then. The last time i drove i got about 2-3 misfires on a 20min drive.

This post has been edited by skogs: Sep 22, 2014 - 12:44 PM

what ecu? what year car engine etc?