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Why will my Citroen Xsara not rev properly?

Do you have any advice as to why my Citroen Xsara 1.4 petrol won’t rev properly? I’ve changed the throttle body and added fuel treatment. It runs and drives but it just won’t give a full rev as if it’s not getting enough fuel and sounds rough?

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There is a known fault on some cars of a faulty ignition coil which in turn causes the failure of the ECU (these are models with SL96-1 or SL96 -9 ECUs). This then results in poor driveability so you may want to check this out. Over and above that we would check all air intake/vacuum system for any signs of leaks.
Also, has the fuel filter been changed in line with service requirements?
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