S-10 4.3 "hunts" at hiway speeds
2001 S-10 w/4.3L 5 Speed manual trans. Engine "hunts" at hiway speeds. Torque is not constant. I can feel the changes in engine power. Accompanied by a drop in gas mileage from 23 to 20 MPG. Took to Chev Dealer & they installed plugs, ign wires and new dist rotor. No change in symptom. Still bad gas mileage. Vehicle has 155K miles and is one owner-me. Most all driving is hiway. What should I do to get the engine performance back where it was and stop the erratic engine?
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