I have a 2008 Tahoe, on the 4th the check engine light came on and was hooked to the computer and the code said it has an error with plug misfiring. Light cleared off and haven't had issue with it on the 7th the stabiltrac off light came on and after restarting Tahoe it went off. For last two days the stabiltrac off light flashes on and off and have also noticed it shifts harder when the light is on. Anyone else have these issues or know how to fix it?