When you get a tune up twice at different locations and get the same reading from both spark plug 4 is missing is that an indication of a crack head?

No, that's an indication that you need sparkplugs, wires or distributor cap.

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When replacing a 2003 headlight bulb should you do both at the same time?

Yes unless the bulb was broken in an accident. Bulbs have a finite life span, usually measured in hours. When one goes the other is not far behind. Replace them both.

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