89 300se is skipping in drive and reverse, engine skips when putting a load on i

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the car idles fine in park, when put in drive it skips, have changed spark plugs, new disturber cap and rotor, new spark plugs wires, have cleaned the idle control valve, and checked houses for wear and tear, all is fine. It just idles like it wants to cut off when in drive and reverse.About 6 months ago I put new fuel pump, and filter on and car has was fine, it was when after I replaced the distributor cap, rotor, spark plugs, spark plugs wires about a month ago when all the problems started.