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Message: <blockquote data-quote="03_sierra" data-source="post: 22016" data-attributes="member: 12063"><p>Hey guys. I have an 03 sierra 2500 with the 6.0, and it’s going into reduced engine power. It usually happens once after I first crank it and leave. I can crank it back up after sitting for about 30 seconds or so and it will move again. The codes shown are p1516 and P0332. What are the most likely causes for the codes?</p></blockquote><p></p>