I think I may have a bad injector, I have not cracked the lines yet to check but strangely as I coast up to a stop, my engine will shake (rack damper fine, new motor mounts) Problem is somewhat intermitant -engine is super smooth at speed with plenty of power, no perceived missing under a load -any thoughts? can our injectors miss at idle but clear up under a load? This is for a '82 300SD OM617 Thanks!