1996 Chevrolet Corsica P0306 Code: Cylinder 6 Misfire Diagnosis and Solutions

I recently purchased a 1996 Chevrolet Corsica and am experiencing a persistent misfire in cylinder 6, indicated by the P0306 diagnostic trouble code. I initially replaced the spark plugs and ignition cables, but the issue persists. I also swapped out the coil packs with no improvement. Using a compression tester on cylinders 4 and 6, I obtained approximately 150 psi each—this reading appears within normal range, though I'm not entirely certain if it's sufficient for reliable combustion. Any insights or recommendations on how to proceed would be greatly appreciated.