Help!! With my 2008 suburban
 

I bough a suburban 5 weeks ago and 3 days ago I was driving down the road when the engine light came on also the traction light. I took it to my friend to make an scan and see what's going on it came out that the cylinder 6 misfire. So we changed the coil number 6 and all spark plugs and plug wires. then We took it back and still misfiring the problem is the truck shakes so bad. I bough it in cash for 17k but the dealer didn't give me any kind of warranty it was sold as it is but it didn't sound that way at all it raided so smooth I don't know what to do any idea what can be?? i dumped Sea Foam in the gas to see if it help but nothing still the same and also the traction light and engine light still on.

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