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Check Engine Light Flashing

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Hope somebody can help. My 2005 Ram 1500 Hemi had a check engine light on. 68K miles so I put in iridium plugs and new wires. Then the engine light started flashing and truck ran poorly, tach jumping around. Then I read here that I should have used stock plugs. So I replaced the plugs with standard Champions. But I still occasionally have a flashing engine light and poor running. This seems to only happen when the truck is cold and once warmed up, the problem goes away. Does anybody have an idea what could be wrong. I've also read here that maybe I should unhook the battery and reset the computer. Thanks for any help.
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