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Truck is a 99 GMC Sierra 2500 extended cab 6.0L rear wheel drive about a year old with me and has about 260,000 Mods: true dual straight pipe with cats New ac delco spark plugs gapped at 0.062 MSD street fire spark plugs at 8 mm Any how one day was cruising and got a soda and started it up and noticed it was running on 3-6 cylinders pumped the gas a bit and all 8 came back coil packs are all sparking to the wire and all the connectors are delivering power 12v Need help with this ASAP next parts to replace will be performance coil packs then the injectors codes where p0300-random misfire detected P0102-maf sensor circuit low frequency P0332-knock sensor 2 circuit low input (bank2) x2 Autozone code summary says replace all valve springs and bad valve springs will cause popping and misfire but it misfires when I start it and put it in gear and only for a minute or so until I hammer down and get all 8 back running this is a very dangerous problem for me since it's my only vehicle and I have 2 children