Fiat won't rev above 2250

Fiat Cinquecento sporting R reg not used for 9 mouth when cold will rev to

4500 but when the temp gauge goes up it will not go above 2250 revs it seems to be misfire as well.I Have remove the rear exhaust box and renew the cat/spark plugs/fuel and air filter but still the same. can anyone help
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mimto
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