Getting codes p2178, p1652 and 1,2 and 3 cyl misfiring codes for my Volvo XC90.

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Rough start and idle in warm weather. Started losing power when driving on highway, would only get to about 60klm/hr, then would idle down and stall out. Towed it home and now it will start but engine is really loud and if I put it in drive it will either stall right away or if I put it in drive and try to accelerate it Will knock really loud and stall. Help please, have no local mechanics who work on engines who will look at engines.