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P0300 - Random Cyl Misfire
P0302 - Cyl 2 Misfire
P0303 - Cyl 3 Misfire
P0019 - Crank/Cam position correlation
P0171 - lean
Usually when there is a chain of codes it's one causing the others. Cyl misfires seem to be a moving target so I assume* that it's the crank/cam position (which is usually a bad sensor 9/10 times). The lean also could be because of the misfire but then again I suppose you could misfire because you are running lean and maybe* that could throw off the sensors. This is why the other guys are asking about what led up to the codes because it will be easier to identify which came first the chicken or the egg. This could be related to the tune or could just be one bad sensor or coil pack or whatever messing up the timing. I am skeptical about it being a spark plug or a coil pack though because even if they are all due to be changed usually one fails pretty obviously and this seems to be random ones.
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