i am attempting to replace the spark plugs in the car, and i was able to easily take out and replace 1, 2, and 4, but i cannot get three out at all.
i have read some suggestions on how to remove the plug using lubricant over a period of days, so my question is, should i put the old plugs back in so that they are all of the same age/condition until i get out the stuck one? or can i leave the new ones in place while driving with one bad plug (and judging by the others, it is probably pretty junked up)? will this have any bad effects for the new plugs or the engine?
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