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BASIC WARM ENGINE DRIVEABILITY SYMPTOMS TROUBLE SHOOTING Accelerator pump defective Repair or replace pump see FUEL SYSTEMS Secondary throttles not closed Inspect lockout adjustment, see FUEL SYSTEMS Sag or Stall After Warmup Defective choke control switch Replace choke control switch, see FUEL SYSTEMS Defective accelerator pump Replace pump, see FUEL SYSTEMS Float level incorrect (too low) Adjust float level, see FUEL SYSTEMS Backfiring & Black Smoke Plugged heat crossover system Remove restriction CONDITION & POSSIBLE CAUSE CORRECTION Hesitation With Small Amount of Gas Pedal Movement Vacuum leak Inspect vacuum lines Accelerator pump weak or inoperable Replace pump, see FUEL SYSTEMS Float level setting too low Reset float level, see,FUEL SYSTEMS Metering rods sticking or binding Inspect and/or replace rods, see FUEL SYSTEMS Carburetor idle or transfer system plugged Inspect system and remove restriction Frozen or binding heated air inlet Inspect heated air door for binding Hesitation With Heavy Gas Pedal Movement Defective accelerator pump Replace pump, see FUEL SYSTEMS Metering rod carrier sticking or binding Remove restriction Large vacuum leak Inspect vacuum system and
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
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