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Message: <blockquote data-quote="DarkNinjaSG" data-source="post: 23825" data-attributes="member: 12584">Hello! I’m back again!I am having a problem with my 2000 Silverado 1500 with the 4.8l. Whenever I hot start the engine, it will drop down to ~300rpm for a few seconds then jump back up to its normal idle of ~550. Almost stalls but the engine doesn't vibrate horribly like you'd expect it to for being at such a low rpm. Won't ever get close to stalling again afterwords when I drive it.I was having intermittent high idle issues that ended up being caused by the IAC and I replaced it. Did it before and still does it after replacing it. The MAF sensor reads consistently and both upstream O2 sensors bounce between 0.1v and 0.9v as they should. Cleaned throttle body already and that didn't help. Spark plugs and plug wires have also been changed (maintenance items). The long term fuel trims for both banks stay below 2%. There also seems to be a weird idle vibration that feels like it might be a misfire every second or so but I don't have any codes showing up (for either issue).Any help would be appreciated!</blockquote>