2012 Mazda CX-9 TOURING AWD It has only 116k Miles; all maintenance has been done - CEL first started just blinking & then alarm buzzer sound twice & now it stays on all the time. Gives code PO306 misfire coil #6 - Replaced Coil pack, spark plugs & fuel injector # 6 - didn't help - When it warms up it looses power going up hill & starts shaking & jerking like crazy. I took it to one mechanic who said it could be a weak computer driver for #6 coil pack & wanted almost $2,000 to repair it but even if we could come up with the money for the repair to get it fixed, he said he didn't have the software needed to fix it. Yeah we have a vibration in the rear that was happening previously & we had to have the tsb bushings replaced in March 2022 the vibration quit for about a month, but now it is back, it's not as bad as it was before, but it is still very noticeable. This is our only mode of transportation and my husband has to go to work tomorrow. We need help Please! Any Ideas ACCEPTED