I have a similar problem with my 1998 156 2.5 v6. I stop at a junction, let go the clutch, the idle drops down the black line..around 500-600 rpms.. then goes back to 900 rpms. But sometimes, as it drops down..it hesitates, and stays low causing the car to stall. I have had a new genuine Bosch Maf fitted recently, and changed the throttle body with a second hand one (cleaned and fitted).. First impression was that it fitted perfectly..but 2 weeks later, I happen to have similar stalling problems..
I suspect the culpit is the lambda sensor..The car has 167.000 km on it currently.
So..guys, do you have any idea to solve this idle problem..?
Any body to guide me where to look for, what to suspect..?
Thanks in advance.
1998 Alfa Romeo 2.5 V6
Metallic Silver Grey + Black Momo Leather, 17” GTA wheels, 215/45/17 Kumho Ecsta KU31, Full Zender Body Kit, Brembo Disks, Ate Brake Pads, Bilstein B4s, Vogtland -40mm, Supersprint Muffler