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Vibration on idle will most likely be the top engine mount. If its coughing out of the exhaust the injectors will need refurb/replace - injectors are well worth doing for the mpg increase.
Both common issues on the meg...both easy fixes. Half hour for the mount - half hour to change injectors.
Standard injectors are £160 new from renault.
You can get them ultrasonically cleaned for around £60
Where abouts are you in the UK , Ill change injectors if you are stuck.
Can identify injectors generally by gently clamping the fuel return line after the regulator, if you have one!some efi don't even run return. This increases pressure and helps push the fuel past the crap/water etc if the engine smooths out you know your injectors are dirty/blocked. This does not tell you your injector coil condition, so you will need an oscilloscope to measure the pattern for that.
Injector flow testing, back flushing and ultrasonic bathing is the best way, which means removal. But again that won't fix a weak/faulty injector coil.
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