hi i have a fusion 2 ...54 plate.petrol........when at idle and i put the hazard lights on. this makes the engine seem to miss a beat every time they flash and car idles lumpy turn hazards off and it idles fine ..... the battery and charging system are fine ..eg ,new battery and alternator checked,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, thanks in advance for any advice