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Hello. My 94 E420 runs great on the highway and at speed, but recently at idle, hot or cold, it can run a bit rough. The engine seems to hiccup for a second. It tends to do it every 20 seconds or so. Also, the acceleration from stop is a bit sluggish and hesitant.
I am second owner from 54k miles. Car now has 170k miles almost all highway. No major repairs, just oil changes, brakes, belts.
Does it needs a tune up? plugs, caps, rotors, wires? fuel pump? clean fuel injectors? or is this an air/fuel ratio adjustment problem? I want to bring it to my mechanic to fix, but I would like to have some idea of what it might be or where to start.

Thanks!!
 

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2000 e320 4matic
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3,401 Posts
could be the wiring harness on its way out. Or the MAF, or the 02 sensor? does it throw any codes?
 
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