Engine won't start
- Intake air leak
- Fuel contaminated/deteriorated
- Pinched or clogged fuel hose
- Faulty fuel pump
- Clogged fuel filter
- Clogged fuel injector filter
- Sticking fuel injector needle
- Faulty fuel pump operating system
Engine stall, hard to start, rough idling
- Intake air leak
- Fuel contaminated/deteriorated
- Pinched or clogged fuel hose
- Idle speed misadjusted
- Air screw synchronization misadjusted
Backfiring or misfiring during acceleration
- Ignition system malfunction
Poor performance (driveability) and poor fuel economy
- Pinched or clogged fuel hose