Rpm dropping

2000 Renault Kangoo 1.4 manual
Car: Renault Kangoo
Year: 2000
Variant: 1.4 manual
Categories: Electrics, ECU, Warnings & Lights
My rpm keeps dropping to zero when I take my foot off the acelerator to slow down or stop ( it restarts with no problem at all ) have had this problem on and off for years .When it first started my garage put in a new speed sensor which seemed to fix the problem for quite a while, ( about 1 year ) then it started to do it again, this time when a new speed sensor was fitted it didn't make any difference. My garage has tried numerous things but nothing seems to work. Its very difficult to pin down the problem as it can go weeks without doing it or it can do it every day for a number of days. The car has been on the diagnostic machine but it doesn't show any problem.Please help me.
Problem added: Mar 29, 2013 (11 years ago)
see your other post for Saturday 30/03
Answered Mar 30, 2013 (10 years ago)
Could be a problem with the turbo if its not holding the revs, does it recover rpm as normal or slower than it was before the problen started?
Answered Jul 9, 2013 (10 years ago)
Have you had a look at this similar problem:

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Answered Mar 31, 2015 (8 years ago)

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