Hi. You need to check the engine timing.
The camshaft belt may have been changed but the the timing wasn`t done properly. If it `s not done right the timing marks may appear correct but the camshaft can be out of position . You need to check at the opposite end of the engine where the camshaft lock tool is fitted.
Clean the Throttle body as the other post suggests. If all else doesn`t fix it then look at changing the unit.
You say you`ve changed the "re-set unit" . Do you mean the VVT Valve ? If so,
is the gasket leaking ?
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