Possible Cause & Correction

- Check the following items.

• Visually check vacuum hoses for splits, kinks and proper connections, as shown on Vehicle Emission Control Information label.
• Check for air leaks at carburetor mounting and intake manifold.
• Check carburetor for flooding.
• Check float level using external float gauge.
• Check engine idle speed, both base and ECM controlled.
• Check EGR system. Check for loose valve or sticking plunger. The EGR system should not function at idle. Pulse width modulated systems do not work in Park or Neutral.
• Check carburetor idle adjustment. If unable to adjust, check carburetor idle system.
• Check exhaust system for restrictions, such as a damaged or collapsed pipe, muffler or catalytic converter.
• Check spark plug condition and gap.