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multiple codes

I'm throwing the following codes:

P0300 - random misfire
P0303 - misfire in cylinder 3
P0110 - IAT circuit Malfunction
P0120 - throttle position sensor/switch "A" malfunction
P0335 - crankshaft position sensor "A" circuit malfunction
P1780 - park neutral position switch malfunction
P0420 - catalyst system efficiency below threshold bank 1

what I'm wondering is if they're connected? why this many codes with 0 symptoms. Car runs just fine.
 
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