Thanks for the helpfull hints
So here's the story:
Its been raining on and off in ZA for the last few weeks, and my 155 has started to splutter, stutter and stall for no apparent reason. The mechanic was stumped when I asked him why this was happening, as the fault is completely intermittent.
So I did some reading on the forum and last night started to look at things that would not cost me money (for a start).
1. I cleaned the air-cleaner filter, put new oil, and driller a bigger hole in the bottom of the air-box for better drainage
2. Replace low beam globe (I know this has nothing to do with the stutter problem, but I have to mention it as it is a very uncomfortable thing to do, as the battery etc. gets in the way)
3. Opened the engine cover, and drained the oil in the plug-holes-----Yes OIL. Now I know what happens to spilt top-up oil.
4. Took out a few plugs, all of them are brown (what colour should they be, and what should the gap be ????)
5. Thought I should fix my washer-jets, as they have not been working for a while. I opened the wiper-tray, found and fixed the problem which happened to be the plastic three way non-return valve that was clogged, and also un-gunked the jets with some thin wire (I knew old cAT 4 computer cabling will still have a purpose). Then I found what I hope is the problem.
One of the previous threads mentioned that water builds up in this tray if the drain hole is clogged. Sure enough, it was full of water. The drain sites in the "margarine-tub" under one of the wiper arms, and it was clogged with leaves and gunk. A quick squirt from the pressure washer fixed this.
I remember from the thread that water from here could run down the loom and wet the ECU.
I startted the motor, let it run for about 20 minutes, and then went to sleep, cursing the rogue gene that makes us Alfa lovers.
Guess what??? This morning the car is perfect , no stutters, did not stall once
Thank you for everyone that posts "unknowns" like this, Touch wood (picture a wooden F50 in Venice) the problem is now solved.
If not, next step shouold be Water temp sensor, Lambda, and if this is not the fix, maybe Coil Packs, although this may be unlikely as the fault is intermittent.
Thanks again everyone
2011 GT 3.2 Centenario, 1972 Bertone GT, 1983 Sud Giardinetta, 1984 AlfaSud Hatch
Gone but never forgotten ..Giulietta QV, MiTo, 1968 Giulia Super, 159 2.4 JTDm
156 2.5 V6,159 1.9JTS, '76 Spider, 156 V6 SW, 147, 155
'77 GTV, 33, Lots of Suds & Sprints