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Old 08-01-2007, 13:05   #4 (permalink)
markedman450
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Join Date: Mar 2007
Posts: 3
Re: Running rough at higher rpms when hot

So from what the dealer is saying its def. the catalytic converters...problem is they think its only one of the two. What are some good ways if any to determine which one it is. I figured drive around for an hour, get under it and see if ones changing colors from being clogged or which one is hotter. I do know that cylinders 3, 5, 6 seem to be blowing through plugs especially 5 if that helps determine anything. I figured if one is clogged, it could have the o2 sensor messing up the fuel/o2 mixture and causing the plugs to burn out.

Any other ideas?
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