only running on two cylinders, whenever I going to drive or reverse car, dies out.

I have a 1984 Volvo DL 244. I have been working on it and trying to get it to run nice. However, I’ve run into an issue with an extremely rough idle. Whenever I put it in to drive or reverse it will bog down, barely hold an idle at around 500 RPMs, then die out. It will also not respond to any throttle, went in reverse or drive. In park in neutral it will hold a rough idle, but car will shake. Sounds like it’s misfiring I replace the spark plugs, distributor cap, ignition coil, fuel pump, and fuel injectors. Help!! I want this car running!!!
 
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