slk 230 engine problems

[pepe]

Hello, i havr a 230 slk kompressor 1997
After storing it 2 years at the garage
Now he start and run terrible engine shake like grazy at the begin it sounds like only 2 cilynders work after a while 3 . Fuel pressure seems ok.i
Sparkplugs are ok , i guess 1 of more injectors are blocked by old fuel? Can i try to drain the old fuel , replace fuelfilter , add new fuel with injector cleaner ? Best regards , verry nice website !