I have a 2009 Buick Enclave, we paid like 4k$ thought it was steal. Apparently I was wrong it has a lot of miles 170k+ But there is no rust no dents no hail damage the interior is nice and I’d love to get this car working correctly. When I first got it it would shudder at about 1800 rpm going up a slight incline in 6th gear. I initially thought the trans was going out and planed to put a new one in... Now it also studders going about 10 mph. then we go for a drive a month or two later and it threw some misfire codeshare well as p000a cam response to slow, p0300 p0302 p0304 p0306 , p0496 valve solenoid, p0011 cam shaft bank 1 to far advanced, p0089 fuel pressure regulator. Can anyone help me make sense of this?