2 weeks and 1st problem

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Hi all. Have done some browsing and read a few posts of issues similar but here is my issue, quick run down of the car. Hks filter, clean and dry. Apexi boost soliniod all pipes present and fitted. Hks bov, all seems good. Walbro 255 fuel pump, taking there word for it. And remap to take car to 350bhp, car drove fine for 3 days, but after heavy rain and my dad stalling it 5 times the car doesn't like going above half throttle, she'll take off but a little jerk near 5000rpm then she'll strange noise kinda like dddddddrrrrrrrrrrrr, car instantly looses boost. No bad smells either. I'm thinking fuel problem and a trip to corten miller Motorsport. Anyone had a similar issue and know what it might be? And is it going to be ok to still drive around casually?