what would cause a cylinder 1 2 and 3 misfire all at the same time?

1998 FORD EXPLORER
173,000 MILES
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MUSTANG.COBRA.GT
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for awhile my explorer has had a very up and down idle but has run great. Today it didnt want to start and then it did and ran fine. I got home and the check engine light came on i checked the codes and it came up as cylinder 1 2 and 3 misfire. What would be the most likly cause for this? it has brand new plugs and wires.
Oct 12, 2012 at 1:38 AM
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