CARBURETED Models (B2200 Federal)

Verify correct air cleaner intake control door operation.
Ensure correct choke adjustment and operation.
Check choke diaphragm vacuum source.
Check choke diaphragm for damage.
Ensure idle mixture adjustment is correct.
Ensure there are no vacuum leaks.
Check PCV operation by clamping hose shut. If problem goes away, replace PCV valve.
Check A/C cut-off system.
Check HAC valve operation.
Check EGR valve operation.