The time for internal inspection is now, long overdue.
Purchase the complete gaskets sets required and slowly begin your disassembly and with cell phone camera, record your order of disassembly. Tear that fuel rail apart and apply a round brush to remove the solidified fuel deposits from the inside of that rail, an inspect to insure that each discharge port to the injects is clear.
Take each injector out and take them somewhere to get them tested, repaired and insure each has the correct spray pattern.
Get a fresh battery and compression gauge and test your compression of each cylinder and record the results.
Compare these results to the repair manual. Follow the troubleshooting section of that manual to do a proper follow-up.
Chances are if there was any rust on the cylinder walls, that and the old oil would make your rings stick to the back of the pistons, rings grooves filled with crud that requires a major tear-down if you can not freely expel that material from the cylinders using a chemical solvent which will help you to blow it out the spark plug holes.
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