MR2 mark3 Spyder Engine Failure

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Had a Toyota turbo fitted by Silverstone Performance in England silverstoneperformance.co.uk. All was well but yesterday had engine failure. After about 250 mile run 50 to go fairly pushed the engine revs dropped all warning lights came up and pulled over to hard shoulder. Managed one engine restart heavily missing. Now at Silverstone Performance. As anyone had engine failure with or without a turbo fitted?