3rd gear is the worst. At about 30 miles per hour it wants to chug and jerks. Accelerating is just fine. It doesn't hesitate. But at a constant speed it doesn't want to run properly. And it only gets 25 to maybe 30 miles per gallon. I changed air and fuel filter and all the spark plugs.
doesn't run properley at a steady speed on 1994 Ford Escort
I would check your ignition wires, cap and rotor for wear.