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2009 DTS codes


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I bought a 2009 DTS back in april 2016 and it's been great for a while, then the check engine light came on and a whole of issues pooped up, $552 later I find out it was caused by a broken wire and the guy who sold me the car had his back yard mechanic bypass the wire and did it wrong, So it was corrected at the dealership, now I am having stablitrak issues come & go with the codes reading misfire #7, my mechanic  doesn't think its the injector because it comes and goes on its own. I replaced the plugs and #7 ignition coil and this was good for a week. It still pops on then goes off  randomly and now I am thinking of just replacing the wire harness, I dont want to touch the injectors... any king of help will be appreciated

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