Hi
sorry to hear about your issues. Cant even suspect what causes that engine behaviour, so getting a proper readout would be your best chance. That OBD reader looks pretty good, but your ultimate best solution would be hooking it up to Vida+DiCE (dedicated volvo diagnostic equipment). You can maybe find a member with this around your area who would be willing to help you, or for probably similar money to MD802 you can get your own DiCE reader. You just need laptop and some technical knowledge to use it (search forum about this). The main advantage is that Vida will read EVERY code from your car and interpret it correctly, rather than giving you generic codes to translate.
Cant really give you any advice on your problem as otherwise its just guessing, sorry.
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