1990 Jeep Cherokee Questions

Unanswered 1990 Jeep Cherokee Questions

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when going up a hill it feel like a turtle . but when I hold the pedal down it take off like jet
I was wondering what gas mileage i will have and the power I can expect. Plus the same thing if I were to lift it 3 inches and go from 27's to 29's. Thank you
And is it possible to test speedometer cable from transfer case by turning the gear manually ? Also if there is no movement on the gauge how than can you determine if the cable or gauge is bad ?
I read that online somewhere. Is this true?
wont start has new fuel pump,crank sensor,map sensor,plugs wires and cap