E30 Zone

Right i've done all the research into this getting on my nerves now.
The car in question is an M40B16.

I have changed the following items and still runs rubbish on cold start and idle, then when its warm it runs better but not amazingly smooth.

Items changed for new bits are:

Blue temp sensor
Air flow boot
Spark Leads
Spark Plugs
Coil
Rotor arm
Dizzy cap
Throttle position Sensor

Cleaned the Idle control valve and it works.
Throttle Body Cleaned

How can the AFM be tested? as soon as its unplugged it runs crap and cuts out.
It smells very rich out of the exhaust.
It sometimes 8/10 does not fire on all cylinders, considering there is only 4 it sounds like a spluttering machine.
The car was sat for 3 years and when was first brought ran perfect.

I have read about the crank position sensor on another site.

Well I had idle troubel on another E30.

All I can add to what youve already checked/replaced is breather hoses? Are they looking a bit cruddy? Though you say sometimes it wont fire all cylinders, which tbh to me (non pro) sounds more electrical perhaps, rather than air flow.

Maybe a problem with ICV?

Anyaway, I found my ICV fault using this site, with a jetronic/motronic troubleshooter

http://www.unixnerd.demon.co.uk/motronic.html

Have you had the exhaust gas analysed (CO2) at a garage or similar, aiming for 1% at idle?

i had the it done at a garage at time of mot which was when it was doing the same thing, i had to send my mot to dvla it was 1.?%

could it be sticky injector(s)?
This was suggested when my M40 felt like it was running on 3, but turned out to be HT leads

Have you had a spray around the inlet with some wd to see if there's an air leak.

Going to rebuild the injectors on the weekend, no airleaks sprays Yeeee old wd40 nothing