AFM problem?

Dan0

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Hi new to the site,
I have a 2007 sierra 1500 slt with 132000 miles 2 days ago I was driving and all of a sudden the engine light is blinking and the service stibilatrack and service traction control comes on. I pulled over and the truck was shaking. tried to drive it home and shifted very hard. The shop scanned it and said and the code was P0300 and was misfiring on #6 cylinder and every now and then on #5. I am not even sure if my truck has AFM. I bought it used from a guy who had it tuned and im assuming he turned it off because it always says " V8 mode " on display so im wondering if anyone has any advice or possibly anything else it could be? It has spark and from what I can tell the injector is firing
thanks!
 
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