Sounds like a classic fob off as they can't work out what's wrong or what they may have done.
140,000mls is nothing for looked after cars.
What was the original injector replaced with? E.g OEM Volvo unit, genuine Bosch unit? ebay cheapie/copy?
There's been many cases where people have changed injectors, for cheap fake Bosch units only to suffer issues which were only resolved by changing back to old or new genuine OEM spec injectors which are pricey.
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2000 C70 T5 GT Coupe
1998 S70 R / 1995 Toyota Supra Twin Turbo
2007 Mercedes CLS 320 CDI / 2011 Mercedes S350 Bluetec
2007 Suzuki GSXR-1000
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