Just moved from Alaska (no ethanol) after 42 years to Oregon (10% ethanol). Using 92 octane in my 1960 quadrajet 283 in a 65 Suburban. Acceleration is smoother when engine is good and warm. When I get to 55 running rough for 5 or 10 miles then smooths out. Same if I run up to 65. New plugs, timing check, vacuum good. Any additives that might solve this? or changes to needles/jets. Was running great before the ethanol.
Paul
Last edited by Peggy M; 10/03/2024 11:09 PM. Reason: added more info to the title
