i have a 2001 mitsubishi eclipse and the other day i took out the far left spark plug out and checked it to see if it needed to be replaced, i put the plug back in and the cover back on top. but now after i drive for a little while the cover starts to pop up. the longer and farther i drive, the higher up it comes. why is this happening and how do i stop it from doing this? if anybody can help me out i will really appreciate it. thx.

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