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The P0171 co is probably the one that is causing the misfire. It's a lean code meaning the engine is not getting enough fuel. This can cause a condition known as lean misfire and cause the misfire code. A vacuum leak is a possibility as well as a bad MAF sensor or even poor fuel pressure.
The p0341 code is a code for the cam sensor. Typically this will not cause any issues other than the code.
Coils and plugs are not the only things that can cause misfires. Misfires can be caused by vacuum leaks, low compression, faulty fuel injectors, clogged EGR ports (on vehicles with individual ports for each cylinder), blown head gaskets, burned valves...you can spend a LOT of money on parts by just going in and replacing things without diagnosing WHY the cylinder is misfiring.
P0300 is a multiple cylinder misfire and is used by all OBD2 vehicles on the road in the USA that is 1996 and newer, P0301 is cylinder number 1..P0302 is # 2 and so on...that tune up may have been needed and parts and labor are expensive..you have a cylinder that is misfiring and the cause must be located..possible causes are intake manifold air leaks..secondary ignition problems..fuel injectors..plugged EGR system if it has one..failed head gasket..burned or cracked valves..I have seen some crazy stuff..you need a tech on that one not a mechanic.
this has a whats called spider injector .if it goes bad like say leak into the intake it will cause these misfires if you have a scanner look at the o2 voltage output on bank 1 if it reads .350 or less and the other side is reading up and down from .250to .850 than suspect a bad spider injecter.