My son's z24 recently started skipping at times. Installed new plugs about 4 months ago. They look fine. Pulled code PO302 (Cylinder 2 misfire). I switched plugs in 2 and 3. PO 302 returned a week later. I installed new plug boots and thought problem was fixed but came back about a week later worse than before. I believe next step would be to replace coil housing. Do these frequently go bad? Is there something else you guys would recommend checking or trying before putting in shop?
thanks david holley