Ok, i have a mazda 626, one spark plug isnt firing, i have replaced the coil

G

Garage411.com

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Have you checked and made sure your spark plug gap is within the OEM spec? The spec info may be in your owners manual, if not then you may need to get a repair manual.
 
pack, and i set the throttle body? i set the throttle body up a little, now i runs, but smokes (white) very badly, when the engine is cold it runs fine, but when it warms i goes bad. thanks
 
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