EFI system problem Vacuum leak
• Intake manifold (Air intake chamber)
• Intake air control valve
• Throttle body
• Brake booster line
Pulling in air between air flow meter and throttle body Insufficient fuel flow Incorrect ignition timing Incorrect valve clearance Carbon deposits in combustion chambers
Repair as necessary Check hoses and repair as
Repair as necessary
Troubleshoot fuel system Reset timing Adjust valve clearance Inspect cylinder head
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