Hello everyone! Does anyone have an idea how a screw from the MAF sensor could have ended up in cylinder #1? I towed my truck to the dealer after it started knocking badly. Techs found a screw inside the engine and found that the MAF sensor is missing one. Needless to say, the 5.3 is done and at 70k miles I’m out of GM warranty. Extended warranty refuses to replace the engine since it was a “foreign object” that caused the issue. Dealer quoted me at roughly $12k between parts and labor for the replacement. Has anyone experienced or heard of anything similar? I’m currently seeking legal help to take further action with the extended warranty company.