We’ve had fuel injected Volvos in the family since 1976. Never owned a carbureted one. The first one was a ‘72 144 D-jet that my bride-to-be owned before me. Fortunately we had a really good (and fair) local Volvo-only mechanic that generously shared his knowledge with me. Otherwise I would have been lost as this was all pre-internet. One thing I’ve learned along the way is that if you are going to drive one of these cars there are two tools that you MUST have in your arsenal - a multimeter and a fuel pressure gauge. Even if you aren’t an electronics genius, which I’m not, knowing how to make a few simple measurements goes a long toward troubleshooting rather than indiscriminate parts swapping. For most shade tree mechanics, like myself, you don’t have to break the bank. Example is my Harbor Freight fuel pressure gauge. Cheap but effective.