Stephen,

My 91 300SE would shake, rattle and roll for a few seconds before stabilizing at idle every time I started the car. New injectors fixed that. Just noticeably smoother idle (I suspect there are other problems). No improvement at speed (nothing to improve).

I replaced the holders as well. It was difficult to fit the o-rings into the groove in the holders but that's as difficult as it got.

An immeasurably small squirt of fuel came out of each fuel line.

Sixto
91 300SE
87 300SDL