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hey guys i have a 91 l98 corvette and i was having a slight misfire around 1000 rpm i changed wires and plugs and still the same, today i open the cap to check it out and in the middle of the cap there is a small button that pushes down on the rotor but it was jam and i tryed pushing it but it wasnt goin in or out like a spring, should it be like that or should it be able to move up and down when i push on it