My rrc 3.9 v9 pretty much always refuses to start when hot I've changed the plugs when I did the service last week and that still hasn't cured the problem, only way I can get it going is by restricting the fuel going to the engine by putting a pair of grips on the flexie fuel hose from the tank then realising them when it fires, I'm really lost and any help would be massively appriceated thank you in advance