1150 adventura misfire

Automatic transmission ??
Check engine lamp illuminated ??
Cold engine idle speed ??
Warm engine idle speed ??
IAC (Idle air control) system operation ??

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possible bad injector - recomend have injector checked and or do compression test on cylinder # 2

have the fault codes read first then decide where to go
an accredited service shop may be a better option

I have a bad feeling. I own a Volvo SW XC70 and I had to change the timing belt because I didn't want to have to buy a new engine. I changed it at around 150K miles. The belt is a composite and is not a chain (metal), so it can stretch, thus giving you "bad" timing and making it impossible to tune. If you have not checked or changed the belt, try it. It really won't cost that much (depending on where you take it. I went to Volvo. Good luck.
DON'T DRIVE THE CAR UNTIL YOU ARE SURE.

the p1400 is also an egr code more than likely the dpfe sensor differencial pressure fuel .....
common trouble with the sensor warranty was extended 2yr - 24k so could be warranty repair

I would definitely scan the computer for the codes that are stored when the check engine light comes on and it misfires. One should know which cylinders are misfiring which could indicate a bad spark or bad fuel delivery to a particular cylinder or cylinders.

Then, if it is a random misfire, it may be a bad O2 sensor that is causing the problem.

The clicking sound when it won't start has to do with the battery or the starter not getting enough current from the battery. A new battery may be recommended after 3 years of service on average, I learned at Sears. Probably the starter is ok but I wouldn't rule it out as something that could be changed if a new battery is installed and it still does it.

If you get ck engine light on , you have a cyl. number
that misfires , ck vacuum leaks on intake manifold around that area aspecially intake manifold gasket.

What did full service consist of? Wouldn't you have this issue checked out went it was in the shop?

i would check wiring at injector 6 for a bad contact if ok test injector