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Its a dpf not a cat.Easy way to clean out[regenerate]First bring the engine to normal temp bring up the rpm to 4000 for 2 mins,then allow to idle for 30 seconds then bring the rpm up to 3000 rpm for 3 mins and yourfilter will have regenerated [fancy word for clean itself out.
DPF = diesel particulate filter.Its important to use good quality low ash oil for your oil changes.
under the bonnet on the back of the mechanical pump there is a unit held in by 2 bolts
remove this unit and on the end there is a tiny filter
this will need cleaning because when the lift pump brakes down tiny parts of it get sucked up through the pipes and clog the filter
it may be best to feplace the fuel filter aswell
take it to a mechanic to check the timing. if the timing is off then it may run at a idle an a little above but once you rev it up then the timing will truely show an it will run like ****. have you checked your air filter that may be another cause. hope this helps