My 94 Buick LeSabre stalls at low RPMs and once in a while hesitates as it cruses at 25 to 45 mph. I haven't driven in the highway. If I rev the engine, like driving in 1st or second gear, it will not stall and hesitate less. Recently, I installed new spark plugs and wires, air filter is OK. I replaced the Crankshaft sensor but the problem continues. Any idea what it could be?
Thank you
Tony