Rough Idle

1. Damaged gasket or loose screws.
2. Pressure regulator vacuum sensing hose improperly or disconnected or damaged.
3. Improperly set or malfunctioning idle switch.
4. Lead wire broken or improperly contacting in air control valve.
5. Foreign matter in air control valve metering unit or contamination.
6. Fuel injector nozzle tip contaminated or deformed.
7. Fuel injector filter clogged.
8. Pressure regulator regulating pressure too low or unstable.
9. Throttle chamber throttle valve orifice clogged.