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P0300 on 07 G6

\015 I have a 2007 G6 with 172000 miles. Had slight misfire you could feel but no light. So, 10k later i a tune up new plugs and wire.After, i was done light comes on so take it all apart again re gap spark plugs and double checked the wires had good ohms. coil was getting power and putting power to wires. and at idle one cylinder one is missing and when i move up to 1000 rmp its 1-5.I'm thinking egr valve clogged, crank sensor, or a type of compression issue. need help dont wanna burn up the cat. and o2 or anything that will make more of a problem\015 Posted / edited by AnonymousUser on : 18-06-2018

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