Hi ,
I've been using this forum for some time and officially registered today . I had
the same problem with my 190E and 560 SEL and new injectors fixed it . I
searched everywhere for decent priced injectors but shelling out $500 to
$600 was just too much . Luckily I waited and found new injectors for the
560 SEL for $330 ( $10 shipping ) from eBay . Item number 8029690124 .Give
it a try ! I did change the fuel filter before changing the injectors .
Good Luck !