Actually there were many M110 engines with A carburetor. A solex 4A1.

What a mess that was. I can't imagine replacing a fuel injection system with a carburetor.

That fuel system needs a constant fuel pressure, proper adjustment and even fuel flow on each cylinder. Mixture in your case can be done by ear. If you have misfires due to fuel it will be because of general mixture problems or specific flow irregularities. By cracking the fuel lines at the distributor (clean up leaked fuel with rags) one at a time each cylinders contribution can be viewed. Cylinders not firing will not be effected when they don't get fuel.

If you have one or two without change try swapping the injectors in those cylinders with ones that work. If the problem moves you have an injector problem. If it doesn't try moving the lines at the distributor. If the problem moves with the line a distributor is suspect. If the same cylinder is bad look for ignition of false air (vacuum leaks).

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician