Q: Fuel problem?? 1993 Chevrolet S10

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I have found fuel in my oil and it has had rough idle for about a month although we just found the fuel oil mix. It has a hard start problem and smells like it's burning rich we've done a tune up changed idle and throttle sensors . Checked timing and replaced fuel pump. Idk I'm stumped

My car has 180000 miles.
My car has an automatic transmission.

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