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Ok so I got a scanner and it says it's code po308 which says it could be alot of things so looks like I will start with the plugs and wires
P0308 is a misfire of the eighth cylinder. (Should be the drivers side, in the rear.) The 6.2 has 2 spark plugs per cylinder. It also has the coil pack to fire those plugs. The question is when were the plugs and or wires last changed? The service interval should be around 90-105K miles. However, there are some from the days of the 2 piece plugs fell every 60K for the change. Getting back to your 6.2, I would check the plugs first. If they look poor, consider replacing all the plugs. If the gap is in spec and looks good, it will probably the wiring or coil in this case. I am just making a general assessment. Look into more about check coil packs for more troubleshooting information.
The last time I ran into a P030x code was my Explorer. The clip holding the plug wire broke. It fell on the exhaust manifold and grounded out before the plug itself. It cost me a set of wires to make the repair but no more misfire from cylinder 6.
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