I have been running a 1999 2 litre 145 TS cloverleaf for about a year. During that time it has proved very reliable, fast and very comfortable. It has only required one rear drivers side wheel bearing which was very easy to change and only about £40 from alfa. Also a clutch slave cylinder at £25 from motor factor. Simple to change once the battery tray is out of the way.
Until, the dreaded tickover problems started. Initially it was quite erratic, sometimes behaving normally, sometimes settling back after a time, or sometimes remaining at 2000rpm. All the usual suspects mentioned on the forum were pursued. First the lamda sensor which was swinging happily between 0.1 and 0.8V. Then a good clean out of throttle body and AFM with carb cleaner and injector ceaner in the tank. No change.
Then a thorough service with new plugs £60 ebay, air filter, check all connectors etc. New AFM £50 ebay and completely remove throttle body for thorough cleaning. . Next water temperature sensor and main relays situated in front of the battery £20 alfa. No change. Final suspect idle control motor and throttle postion sensor at £140 from alfa. Now ticking over closer to 3000 rpm.
Desperation time. Booked into local auto electrics for ECU check. £120later, fault found. Nothing to do with any of the sensors or engine management systems, but a little spring loaded shut off valve where a breather pipe from the cam cover enters the inlet manifold just downstream of the throttle body. Apparently valve not seating and the car sucking extra air causing the high idle. Similar effect to an inlet manifold leak. New valve from alfa £2 pounds and 80p! Tickover now rock steady at 800rpm and again a pleasure to drive. Theres a lesson here somewhere!
Looking through the on line alfa manuals I cannot see this valve identified anywhere, but the alfa part number is 0071713715 There is another breather pipe from the cam cover which enters upstream of the throttle body, but its the downstream one you want which enters the inlet manifold via this valve.
Hope this helps someone.
Oh and another thing, If your headlights won't adjust I think you will find that either the adjusters have stripped their threads due to overtightening or the ball ends have broken off the sliders where they connect to the reflectors.