Cylinder 1 Misfire

What is your question?

2007 Camry LE, 2.4L i4, 94000 miles. I got a code a few times, P0301, indicating a misfire in cylinder 1. I installed a new spark plug, and still got misfires. So I switched the ignition coils of cylinders 1 and 2, and still got a cylinder 1 misfire. How should I proceed from here, having ruled out spark plug and ignition coil?

What makes this problem better or worse?

Misfires when increasing throttle, only occasionally

How long has your 2007 Toyota Camry had this problem?

2 months