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Solved:Had a similar problem every other day. whilst driving I would lose throttle response, erratic idle and no power and need to hold throttle down and eventually very slowly the rpm comes up and it would suddenly clear and rev up high with a puff of black smoke?? no fault codes.
Removed throttle body and EGR body, but other than needing a clean it did not fix fault. Noted a week later, with the engine cover off, a lot of air was bleeding into and running along through the clear fuel pipe across front of the engine, removed the fuel line quick connect coupler fittings fitted to either side of the filter, cleaned seals inside fitting and re seated filter housing and the screw top valve on top of fuel filter housing, reassembled, used a cheep halfords fuel primer / vacuum pump to assist in getting the pump primed (connected to the return fuel pipe) when it started no air bubbles were seen running along pipe and the fault has not reoccurred after 4 weeks. (must be safe to think it is sorted but it will probably go and play up again tomorrow now i have posted this)
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