Hi. My 2014 Forester exhibits rough start and one backfire when the engine is cold. I just bought it wit 72k miles.
Before I drop a bunch of money on replacing parts, does anyone have an idea what may be the issue?
Bad fuel injectors. Probably carbon buildup with poor spray pattern and weak atomization so the unburnt fuel after fires.
The cheap option is to try running a quality fuel injector cleaner through it for a couple tanks. Try 104 fuel injector pro. If that doesn't change anything for the better time to start planning for more work and money being thrown at it.
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