Today my pickup gave me a not-very-subtle hint that it has begun to brew a new surprise for me. Judging by the sounds I heard when I started it up this evening for the drive home, I'd wager I've got a healthy case of piston slap building up. Based on my knowledge of engines and past experience, I'm guessing that either my rings or my bearings (or both!) are on their way out the door. This is a pricey thing to fix because it involves pretty much dropping the motor out and rebuilding it.