the surge on coast means its is getting fuel from somewhere. could be engine oil building up in a PVC system, or whatever is restricting the fuel is letting loose for instant, example collasping hose somewhere or fuel sloshing and cleaning the screen off in the tank. my old VW has a very fine screen in the tank which can get plugged a cause a vacuum in the supply line, but if you have a pump in tank then it could be plugged and not even show a vacuum. check fuel delivery pressure under load.
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