Possible causes – Faulty spark plug 9– Clogged or faulty fuel injector 9– Faulty ignition coil 9– Fuel injector 9 harness is open or shorted– Fuel injector 9 circuit poor electrical connection– Ignition coil 9 harness is open or shorted– Ignition coil 9 circuit poor electrical connection– Insufficient cylinder 9 compression– Incorrect fuel pressure– Intake…