ricmarcarp

Have a 69 grande with a 1971 cleveland engine that was rebuilt 4 years ago. Only drive it from mid april - mid oct. Take it in for tune-up & oil every spring. This year after the usual spring maintenance, after about 20 minutes of driving it starts to sputter & chug. Idles fine, runs great for the first 15 - 20 minutes. Have changed coil & distributor, no help. Any ideas?

akdoggie

Old gasoline or dirty fuel filter. ??