I have a 1992 w124 2.6l sedan. After the engine is hot and driven for awhile...restarts are rough. When restarting, it seems as though its chocking for something, not firing on all cylinders reaction, engine is bucking around. After a few seconds and providing a little more throttle it gets back on track. This seems to get worse when using the air conditioning yet, im not sure. You definitely want to turn off the air conditioning before restarting otherwise more difficult to start.
i had the engine tuned and added new spark plugs, cables and new fuel filter, still has this problem.

thanks for the help.

Eric S.