l have a renault clio 1.4 T reg. It has started to occasionally speed up when take my foot off the accelerator, so if l am changing gear the revs scream. It happens at any speed and is random, although it does it more if the car has been stood for a while. Help! The garage does not know what is wrong!

Woa that sounds dangerous!

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That doesnt sound good.

Probably the accelerator cable sticking due to being seized or kinked. WD40 required.

It sounds like it needs a squirt of WD40 around the carb.

your accelerator is probably sticking

Your drive by wire is acting up , you will have to get this checked by a Renault dealer with the equipment to analyze this computer run system

A friend of mine had the same problem with his VW Golf.

It`s a simple fix, you need to pop the bonnet and check around the engine block for Gremlins. They don`t like sunlight, so just do it during the day and drag that little bitch on outta there. Don`t get it wet though for gods sake, you`ll have an epidemic on your hands.

Sounds like it needs a computer diagnostic check by a Renault dealer. Local independant garages dont often have the equipment to do this.You could ring for a quote.

The throttle body may be damaged, get it to the nearest Renault service centre (or in some case, a good shop with diagnostic machine) to get it checked.