Renault

The engine has been scanned twice and nothing shows as faulty. we bought new boxes and leads and plugs the problem still remains. we are now getting desperate as no one seems to know the problem. help!

I suppose you need to define "kangaroo" a bit more. do you mean that in low gears it starts with a jump or that the engine sounds rough and the pick up is lumpy? it could be a clutch problem.