2009 toyota matrix 1.8 L. Check engine light is on. Code is P0304 for a cylinder 4 misfire. I replaced the coil pack and spark plug. What else could it be? Also, there seems to be a sound like an exhaust leak. When placed in drive or reverse, it idles rough until take off and/or heated up to operating range. After so long it dies when stopped and in one of those two gears. Otherwise it idles fine when in park or neutral.
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