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Faulty High Speed Operation Incorrect ignition timing Reset ignition timing see ENGINE PERFORMANCE Defective distributor centrifugal advance Replace advance mechanism Defective distributor vacuum advance Replace advance unit Incorrect spark plugs or plug gap Check gap and/or replace spark plugs Faulty choke operation Check choke and repair as required Clogged vacuum passages Remove restrictions Improper size or clogged main jet Check jet size and clean, see FUEL Restricted air cleaner Check filter and replace as necessary Defective distributor cap, rotor or coil Replace cap, rotor or coil Misfire at All Speeds Defective spark plugs Replace spark plugs Defective spark plug wires Replace spark plug wires Defective distributor cap, rotor, or coil Replace cap, rotor, or coil Cracked or broken vacuum hoses Replace vacuum hoses Vacuum leaks Repair vacuum leaks Fuel lines clogged Remove restriction Hesitation Cracked or broken vacuum Replace vacuum hoses hoses Vacuum leaks Repair Vacuum leaks Binding carburetor linkage Eliminate binding Binding throttle linkage Eliminate binding Binding choke linkage or fast idle cam Eliminate binding Improper float setting Readjust float setting, see FUEL Cracked or broken ignition wires Replace ignition wires Rough Idle, Missing or Stalling Incorrect curb idle or fast idle speed Reset idle speed, see see
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
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