I don’t think it is your timing belt unless it has jumped a tooth or two. I once ran my 90’s t-belt for more than 100k with zero issues. Just removed the cover and checked it periodically.
No codes for fuel issues. If the engine is shaking that violently it could be a very bad FPR (fuel pressure regulator). A friend’s 740 did that. Pull the vacuum hose off the fuel rail. If fuel inside or strong smell of gas the FPR is bad. As mentioned by KGV, if it only happens with less than a 1/2 tank of gas it could be the in-tank pump. If the main pump is truly bad the car won’t run or run for very long...:)
A totally clogged catalytic converter might cause those symptoms.
I also suggest doing a search for vacuum leaks. A bad intake manifold gasket will also make the car run like real cr**.....
Will I buy another Volvo??? We'll see....
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