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Q: Ford Crown Victoria misfiring after spark plug change, What could be the cause? on 2001 Ford Crown Victoria

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Codes: NA 101, P0306, P0307, P0308

I have a 2001 crown victoria that is misfiring on 3 cylinders: 6,7,8

So far this is what I have done:
replaced all 8 sparkplugs
replaced two coil packs on cylinders 7 and 8 (1st cylinders misfiring)
After I changed everything I hooked up a scanner and now cylinder 6 is misfiring
When I changed the spark plugs on cylinders 7 and 8 there was brown liquid on the plugs

I have not cleared the 7 and 8 misfire codes after replacing plugs and COPs to see if its fixed, but the car seems to run better after changing everything (used to idle roughly).

The car was sitting for 6 months when I brought it but the tank was near empty (fuel light on)

The car has a delayed acceleration/lack of power but will accelerate to over 80 and the CEL flashes when I accelerate over 45mph.
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