update:

ive got a ford puma 1.7. but a the moment at 1700rpm, only on the overrun she judders(kangaroos)quite violently. there's no misfire's and its pulling fine. ive had a ford technician have a look at it and he says there's no visible problems so i will have to get it hooked up to diagnostics.
i was just wondereing if someone's had this problem before and could tell me what the problem is.
p.s, when moving and in neutral it stays at 1300rpm and doesnt drop back down to normal idle.