My focus had the same issue when under load it would suddenly go into limp mode but reset itself when restated. I chenaged the fuel filter and during the course of this work found that there was a leak in the fuel line after injector 3 allowing air in. I replaced this and have had no problems since then.
Though i completely agree with the previous comment about putting the DPF back in, as the previous time I had a loss of power was when the EGR was clogged up and that cost me to replace, also ended up blowing the turbo during the forced regen. Why did you take the DPF out? topping up the dpf resiviour is a 5 minute job and the fluid only costs about 40 quid for a litre, and doing that will keep your engine healthy.
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