I have a '92 190e. From a cold start the car will often run poorly for the first 2-3 minutes. It will struggle to get to 30 mph. After this spell, it runs better, though it has a mild miss at idle (once a second or so), and bogs if you press the gas past 1/2 throttle. Keep it below 1/2 and it performs ok, though doesnt get over 25 mpg.

Ive seafoamed, changed the plugs, and fuel filter.

What could cause this? EGR? Smog pump?