In case someone else comes across this issue, as there wasn't a documented fix on the Volvo forums I did a general search on the internet for diesel cars with these symptoms. A lot of reference was made to the air/fuel mixture not being correct, some which mentioned spraying carb cleaner around the intake to see if there was an air leak.
having sprayed carb cleaner around the engine, there was no change in the characteristic of the lumpy idle during the time my symptom existed (20/30 seconds), car kept cutting out when applying the accelerator on cold startup.
I wasn't able to code my injectors, so I did the following:
1. Reset all adaptions via VIDA: Injectors, EGR, Throttle body and I think MAP & MAF sensor, there might have been others but I reset anything to do with fuel and air.
2. cleaned out MAF sensor with electrical contact cleaner (the sensor seemed relatively clean for a car with 130k miles).
3. cleaned out the MAP sensor with electrical contact cleaner (this seemed to have soot around it).
4.my air filter housing had screws which would not tighten so was loose, I fixed this so it was air tight.
5. I added a bottle of Forte injector cleaner and drove the car for about 20 miles on a dual carriageway, opening it up. I did notice black smoke for the first 1 or 2 miles.
I have since started the vehicle twice after being parked for over 8 hours and on both occasions, the lumpy start, rattling has stopped and applying the accelerator has not resulted in the car from stalling.
although I can't pin point which one of the above helped or if all of them had some impact, these are simple/cheap enough options to try if you have a similar problem before changing parts.
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