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The old ones will most likely be black with carbon build up and eroded (metal worn away from electrodes). This plug erosion will cause the plug gap to increase, making it harder for your coil to fire or send spark to the plug. This problem will cause a rough idle and hesitation during...

I have a 1993 Dodge dakota 5.2 liter with an automatic trans. When started and driven in the morning, it will go into overdrive one time, but will not go back into overdrive once it downshifts. This occurs every morning and I am still trying to diagnose the problem. My first thought would be the...