Hi everyone. I am having a slight problem and only slight. I have a 2000 Mitsubishi Galant with only 65,000 miles; sometimes while I am driving I feel a slight rumble, very slight, then my check engine light, comes on; but as soon as it comes on, it goes off, and there is no more check engine light or rumble. Is this something I should be concerned about? I can't bring it to Auto Zone and generate a code because the check engine light literally NEVER comes on. So since it is not on, their machinery is unable to produce a code. Has anyone else had this issue? If so, PLEASE let me know. Thanks!!