My trusty 10 year old 156 Sele was starting to be a little bit 'fluffy' after a cold start, but always settled down after a couple of minutes. So - 'clean the mass airflow sensor (MAF)', I decided.
Couldn't find any switch cleaner (isopropyl alchohol) in the garage, but I had an inviting can of brake/clutch cleaner (toluene). 'That'll do nicely', I thought. Big mistake!
After a liberal squirt and a gentle rub with a pipe cleaner, I re-assembled it only to find that the engine ran like the proverbial bag of nails. It didn't want to tick over, and every time I lifted off the throttle, the whole car went into violent spasm. Indeed, in order to get it back home from the shops I had to disconnect the MAF. It still wasn't happy, but at least it got me home.
Further careful cleaning and a good blow with an airline failed to improve matters, so a new MAF it had to be (preferably a genuine Bosch one). I contacted emissioncontrols.co.uk (recommended by someone on another thread) and got the replacement by return. £85.29 all in.
Apart from having different torx bolts between the body and the sensor, it seemed to be identical to the original, which reinforced Emission Control's claim that it was a genuine replacement.
New one fitted - big sigh of relief. All's well
Lesson learnt - don't mess with toluene!