Rough/Unstable Idle or Stalls

1. Improper idle adjustment.
2. Choke valve not opening.
3. Overflooding in carburetor.
4. Incorrect fuel level.
5. Lean inlet air.
6. Restricted exhaust system.
7. EGR valve stuck open.
8. Clogged nipple of EGR valve.
9. Clogged passage in EGR valve.