I'm not trying to push RCeng But I have sent several sets of injecters there & there are always 1 or 2 partially clogged. Never had any that needed replacing, every injecter was improved by the cleaning & average flow improvement is about 10cc per minute. Always smooths engine idle noticeably & improves power thruout rpm range. I am sure there are shops all over that can do this I just have never used anyone but RCeng & they guarantee 2 day turnaround.