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Could be egr but I would be checking map sensor,pipework for air leaks and maf aswell as they all work in conjunction with each other.
Fuel pressure issue initially I would replace the fuel filter unless it’s been done recently and if that fault persists measure pressure from LPFP and go from there
 

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Honestly I wouldn’t let Kwik fit anywhere near my car for anything other than tyres and even that’s a last resort.
Take it to a proper garage ideally a specialist that has good reputation
 
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