Sounds like classic MultiAir related misfire on cylinder 2 (P0302). This is not very common but some who had this have finally managed to solve this by replacement of the Multiair 2 module. The filter is in the head and cannot be easily replaced without dismantling the engine unlike the Multiair 1 versions in the Mito/Giulietta.

See this post for location of MA filter.

Coldstart misfire and rough idle.

I been experiencing my 2019 Giulia ti sport (400miles) to shake and feel bouncy(misfire) until rpm reaches under 1000 upon coldstart or if car sits for more than 3 hrs. . After 40 sec it does not do that anymore and it become normal. Two dealers so far said this was normal for alfa vehicles but...

www.alfaowner.com

and this for MA replacement:

Coldstart misfire and rough idle.

I been experiencing my 2019 Giulia ti sport (400miles) to shake and feel bouncy(misfire) until rpm reaches under 1000 upon coldstart or if car sits for more than 3 hrs. . After 40 sec it does not do that anymore and it become normal. Two dealers so far said this was normal for alfa vehicles but...

www.alfaowner.com

 

@metalgod23
Thanks for the info.

I guess it's better to replace the MA unit. However, it is going to be a pain to convince the dealer of this information.
(Actually, they are in denial that it is the MA unit problem.)
We can only hope that it will reproduce under the dealer...

I found out that if I wanted to replace the filter on the MA2, I would have to go through the trouble of replacing the entire MA unit.
Also, it does indeed occur only when it's cold. I think the humidity was too high, but I didn't measure it exactly. The humidity is also low in Japan during this season.

 

Sadly, it recurred yesterday.
It was cold and rainy (sleet).

I read the error code and found the following CODE.
Uniair's Cyl2 also detected the error.
I did a full scan as far as I could get from this time, but I noticed that the body computer system was also throwing up errors.

I'm not so sure if this is just a problem with the multi air unit.

U1008-00
P0302-00
P0300-00
P0363-00
P1062-00
U1713-2F
B1040-64

 

I contacted the dealer today and they are going to replace the multi air unit.
They don't have it in stock, so it will take a while.

@metalgod23 I want to thank you for all your help. I haven't replaced it yet, so I don't know what the outcome will be, but so far it's going in a direction I'm happy with. Your information has been helpful. Thanks again.

 

No problem. Keep us updated on the outcome without forgetting.

 

The MultiAir unit was recently replaced.
So far, no problems have occurred.

I'll monitor the progress.