engine or thansmission on 1995 Buick LeSabre

When going up a hill, car seems to misfire. When transmission changes to OD, it seems to have a hesitation.

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1 answer
You may very well have an intermittent engine misfire. You engine is under more load when going up a hill and that is putting more strain on the ignition system. I would suggest checking spark plugs, plug wires, and ignition coils.