I'm having an issue with my 2002 Mercury Mountaineer with the 4 liter. It's throwing six codes after I swapped the plugs and wires. I replaced the wires and plugs one of the time so that I didn't get them wrong . it's now throwing codes P0300 P0304 p0306 pending codes are p0174 p0303 and p1151. totally stumped on this issue. I replace the spark plugs because while trying to troubleshoot a p0306 code I found that the spark plugs had over a quarter of an inch spark gap they were worn that bad I'm assuming they were the original spark plugs and it has a hundred and fifty-seven thousand miles on it. also I replaced the upper intake orings checked for vacuum leaks and replace the fuel filter.
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