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hi my 2002 elantra is running rough if when u stat to pull on too the street w a/c on drops power autozon said 1st cylinder is misfiring changed sencer and plugs any ideas
 

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What sensor ?

Plugs ?? replace with NGK platinum.. did you look at the black plastic potion of your wire end for dis-color or sign of arc through (black fuzzy crack line and grey/white/blue dust)...

Spritz carb spray along intake to head seam and look for intake gasket break... quit common, though more so on #2 & #3..
 
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