Not a bad idea but would be a waste of $$$ unless they had dirt/rust in the complete fuel system. HAVE tested many original injectors with 150K + more miles that were still good!!
The PLASTIC heat shields start cracking at 6 or 7 years & then idle problems can happen. Also all of the rubber connecting tubes can cause this.
Also have tested NEW injectors from MB that didn't spray that well.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)