After getting my brera the idling was a bit lumpy, it seemed to drop and then something kicked in to bring it up again with a bit of a judder thrown in too! This was happening when it was cold and up to temp.
It had an EGR fault when i first plugged the laptop in, so I cleaned that (packed with soot!)
the fault cleared but idling was still off.
I gave the MAF a blast with electrical cleaner and noticed the main air pipe at the front wasn't actually clipped, it was just pushed on with the clip hanging there. It was a pain to get the clip pliers in to re-fasten, so i'm wondering if someone couldn't be arsed and just stuck it on. Anyway it didn't make much difference, but better it's on now i guess.
Finally I had a look at the MAP sensor. It was completely packed with soot again, so gave it a clean with carb cleaner, did an ECU reset and it's idling perfectly!
So far with my coolant explosion and idling fixed it's cost me a grand total of £5.20!
Quick question though. In my old 156 2.4, the inlet manifold and MAP sensor were covered in a black sludge, whereas this one is just dry soot. Why is this? I take it the sludge is a result of oil but where does it come from and why is there none in mine? (I don't want it, was interested to know why there is a difference!)