You might have too much carbon build-up on the egr ports, in your intake system, causing blockage to the passage of a few cylinders. This lets too much recirculated egr gas enter only one cylinder, causing that overgassed cylinder to misfire and stumble as you try to accelerate.
Check your fire(spark plugs, wires, distributor cap, and rotor button) and air filter, but you might also consider replacing the fuel filter.
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