My Jimney has a fault which the garage locally do not seem to find out what it is. It will go fine for days, then it seems as if there is no excelaration and there is a loud noise coming from the back. It then drives very slow with not much exceleration, and will suddenly clear and run fine. This seems to happen on very odd occasions, and the car also judders when it runs. The garage suggest taking it to a Suzuki dealer for a diagnostic check, do you think this will help.