You can use spray carb cleaner with one of those plastic tubes to force cleaner through the injector and/or soak them in it.

You can have the spray pattern tested. I was quoted $75 for a set of eight. With 167K on the clock, and since you have them out, you might consider replacing them since it will have to be done eventually.

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe