Im having P0300,P0301,P0302, previously had issues with cylinder and fuel injector 3. Any help.

Question

Haven't had the check engine light come on since repairing cylinder 3. There was low compression in cylinder 3.

Answer 1

Low compression. that can only happen due to a mechanical condition, Now you have a had a repair done for the low compression and are now experiencing a misfire on cylinder 1 and cylinder 2. . Ignition system is what you should suspect , such as the ignition coil,