I've had this issue ever since I did my timing chains, at idle there will be a very strong raw fuel smell in the car but once moving its fine, cats plugged? Exhaust leak? evap issue maybe, There isn't a fuel leak in the engine bay. So not sure what the issue is but it can be bad some times. Could just be running rich even i guess? I did replace 02 sensors but that didn't fix my 02 sensor code its a harness issue idk what do you guys think or has any one experienced strong fuel smell at idle.