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1986 944 Turbo Intermittent no response to throttle

Engine

Vehicle Information: Year: 1986; Engine (type, size, modifications): 2.4 liter turbo, shimmed wastegate, Weltmeister chips, KN a/f; Total Mileage: 130,000;

Occasionally, when attempting to accelerate from a stop, there is no response from the engine. The engine won't stall, but I can't rev it up. After a minute or less, it runs fine. This began happening last year, many years after the engine modifications. The shop could find no codes stored. It seems to happen more often after a hard run in summer temperatures. It has happened on the track and I thought it was because the air inlet hose to the intercooler had come loose, but it still has the problem.

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