microtoad, I too had hesitation problems a few months ago. I took off my distributor and found that my camshaft seal was leaking. I had a gritty/oily mess in the distributor cap. One of my sparkplugs was bad. After installing new sparkplugs, camshaft seal, rotor & distributor, the car was running smooth again. Recommend you check the basics first.

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1991 190e 2.6 190,000mi