I have a 1992 Brumby with the EA81 engine and it has always been serviced and runs well. However, recently it has a developed a problem that when it is restarted from warm/hot the engine will buck continuously. When the engine cools down or is started from cold you can drive all day without the engine bucking. As soon as the engine is stopped and re-started the engine will  begin bucking. I have taken this vehicle to 5 different mechanics - all good - and none have been able to wo