I have a 1999 chrysler concorde and I just changed the spark plugs and one ignition coil and now my front catalyctic converter turns cherry red is there a reasoned why?

Or we could just say take it to someone that can put it togather as well as they can take it apart. Thanks for the 2 thums up. Next time post the whole story before you vote. All I was trying to do is anser your question. I dont have a chrystal ball. Or we could just say take it to someone that can put it togather as well as they can take it apart. Thanks for the 2 thums up. Next time post the whole story before you vote. All I was trying to do is anser your question. I dont have a chrystal ball.

First off I said and now the converter is turning red second how can the wires be crossed if they are coil over ignition coils and I only changed one and when I did the spark plugs i did them one at a time and I didn't say u had a crystal ball I ain't trying to argue with u im just trying to figure out the problem anything else u can think of that might b helpful I just don't know what could b wrong also no trouble codes im just getting a ding noise after running the car but no lights come on either First off I said and now the converter is turning red second how can the wires be crossed if they are coil over ignition coils and I only changed one and when I did the spark plugs i did them one at a time and I didn't say u had a crystal ball I ain't trying to argue with u im just trying to figure out the problem anything else u can think of that might b helpful I just don't know what could b wrong also no trouble codes im just getting a ding noise after running the car but no lights come on either