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Message: <blockquote data-quote="INW-Iron-Steel" data-source="post: 24208" data-attributes="member: 11733"><p>Sounds like you may have found your issue. Adding to this in case someone else is hunting a "mystery misfire". More specifically P0300 (random misfire) but it is general advice. Check the grounds. GMT800s are plagued with ground issues causing all sorts of electrical issues. Check the main fuel pump ground on the frame under the drivers door, the coil ground (g102) on the front driver side of the block, and the two main grounds at the back of the block. Passenger side rear block ground is main PCM ground, which can cause all sorts of weirdness.</p></blockquote><p></p>