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Great advice.
Vacuum leaks would be my first guess. It's a fair bit of work to take the battery and air box out and start replacing vacuum lines as there are a number of them on these turbo engines, and a few different sizes and you have to keep track of them all... but it's well worth it. You'll likely find a number of soft and/or cracking lines in there that need to be replaced. There is a lot of heat under there and those hoses are old.
Also it will never hurt you to clean your IAC and TB, and also get a new gasket for your TB - cheap, easy, quick, and effective... the best kind of DIY.
I would certainly try this cheap stuff before I rushed out and bought an expensive sensor.
FWIW I was having a similar problem and I changed my vacuum lines at approx the same time that I flushed my tranny fluid, and the problems stopped afterwards. It could be I was having a problem with both. It seemed to me that it was possible that the torque converter was not un-locking when I was coming to a stop... stalling the engine out.
Whether it was the tranny flush or vac lines that fixed my prob, I would still recommend you flush your trans fluid unless you know it's been done in the last 50k miles or so.
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1998 V70 AWD Turbo 195k+
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