No drive 98 s10

Bought a s10 the other day everything very clean and we'll taken care of, any how I punched it leaving a house on a dirt road thinking nothing of it and all of the sudden it just seemed like it was in neutral as if the tran took a poop. Reverse first second and third all worked fine so I took it on the highway manually shifted from first to drive and it started working, so I punched it and it took off then it did the same thing again were drive was like neutral so I RE did it and drive now works as long as I drive it like your grandpa , check engine light was on when I bought it I know the last 2 of the 3 previous owners non of them said anything about tran issue. I've never owned anything other then my 72 c10 and I'm hoping it's a computer issue vs a new trans.
PS last few days I've noticed stuff like I couldn't find a sweet spot between 50 mph and 70 is was either one or the other and also when I got on a highway it wouldn't let me go past 40 I pulled to the side put it in park back to drive then it was just fine.
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idon't know what you mean by sweet spot. 40mph is shift point for 2nd to 3rd.
Sounds like to me your future holds a transmission rebuild.