I would try the double-dose of Techron approach first. Add two bottles of Techron fuel injector cleaner (not fuel system cleaner) into less than a full tank of fuel. Go drive the car hard when warmed up and see if you can get the mix to clean your injectors.

Your engine specs a 91 octane, so if the fuel is good that should be enough.

I do this will all the cars periodically and it definetly helps.

I change the oil afterwards.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)