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Message: <blockquote data-quote="someotherguy" data-source="post: 21203" data-attributes="member: 6178">At 275K if that's the original distributor, it's almost guaranteed to be worn out.  When you pull the cap off next time, try turning the rotor either direction and simultaneously give it a gentle shove side to side as the rotor pops up.Forever ago, my '96 C3500 wrecker with the Vortec 7.4 had.. can't remember the miles?  But a boneyard engine with unknown miles on it.  It ran strong but had a hiccup at highway cruise.  Upper bushing for the distributor shaft was toast.  Replaced it and no more issues.  *edit for clarity - replaced the distributor.Had another '96 7.4 that I swapped into my '94 3500HD when I built it into a wrecker, had 236K or so when I looked into ignition issues on it, and the upper bushing was so bad that the new rotor I'd installed had the little plastic ridges in it chipped away by smacking the terminals inside the cap.Richard</blockquote>