Rough idle, code P1232, occasionally it will throw 0304. Checked balance rates, inj #4 shows 15 even, the others are all good to go. Checked the cabling at the alt bracket as I found online, all good there. Tested ohms across the connector on the drivers side for #2 & #4, both show .5ohms there so I think the injector or at least the solenoid is good. I'm guessing I have a grounding issue somewhere in the harness? This happened after the dealer replaced the FICM btw.