Had something similar happen to my 76 450SL after I replaced all fuel injectors.


All vacum lines replaced last year.


Had a new tune up(plugs, rotor, cap, wires), new fuel distributor, replaced all injectors and then within 100 miles had a miss at idle and when I started to accelerate from idle.

Thinking it could be exhaust, I hollowed out the converters, and put them back on with new exhaust--( had to do exhaust work anyway) problem was still there.

It turned out to be a bit of crud that was loosened when the injectors were replaced. Somewhow it got in one injector. All I had to do was run one bottle of Chevron't techron cleaner through the system.

Problem solved runs like new. That was 5K miles ago, so I know the problem was really solved.

Cheap solution. I woud try that before I got into replacing parts.

Good Luck