1996 Other Renault Models engine misfire

I have a 1996 “N” Renault 5 1.4 injection.

The car performs okay until the engine gets warm then starts missing badly.
When you turn the engine back on it starts racing.

The warmer it gets the worse it performs

I’ve changed : plugs ; plug leads ; rotor arm ; distributor cap.

I then called in a diagnostic guy who told me to replace the engine sensor cable on the engine management side which I have done.

This made no difference what so ever.

He then told me to change the coil and control box which I have done

This made no difference what so ever.

I’ve sprayed WD40 around inlet manifold

I’ve sprayed carb cleaner into carb

Can you please assist