Newbie here who has his (wifes) first Alfa.
I'll try my best to describe the problem, then will explain what I have already done to try to resolve the issue
The engine has a idle misfire and a poor pick up. its worse when cold.
The engine managment light was on indicating a no. 4 misfire. I cleared the fault changed plugs, leads and No.4 coil pack. still no different. checked live data on the diagnostic tool and found fuel trim out and what i believe the down stream, (after cat) lambda showing consistent 99.92% reading when the other two were all over the place 0.200 > 0.900 and so on. I've changed all three lambda sesnors and also tried a new MAF sesnor. unplugging each coil pack in turn made a significant drop. after doing all this it runs a little better but whilst driving it keeps losing power, engine light flashes, then it will clear, drive fine again for a little, then power will go again, and so on.
All i'm left with next is to try new injectors.
But i must admit, being a land rover guy this is the first alfa I've ever worked on. so hoping someone would have come across this before and will know exactly what the issue is before i go throwing any more cash at it....