OK, so you're all probably tired of hearing from me by now but i have another concern that just came up. If you have followed my last post you will know that i just replaced the VCT solenoids and the knocking has completely stopped--truck is running smooth, no stalling, no tapping sound while driving--however, there is one engine noise that i am still hearing. I actually hadn't heard it since the repair until tonight when i pulled into my driveway. BTW i have 06 expy 120k miles. My driveway is at a slope so i have to give some gas to make it to the top, and as i was about halfway up i was nearly at a stop so i gave just a little bit of gas, and the engine made kind of a rough rattle sound. As i parked, i popped the hood and gave the engine a few short revs and i heard the same noise (i wanna say its kinda like a rattle, but i'll post a video here so you can hear it yourself.) Let me first say that i don't hear any sort of knocking or any bad noise at idle whatsoever--all sounds fine while driving as well--seems like this noise just happens at very low RPMs from a stop. OK so i'm going to post a video so you can hear. This is the same clip i recorded from my previous post because it is the same sound, except i have changed the solenoids since this clip so a lot of the engine noise in the background is no longer there. Just listen at when i rev the engine--it doesn't sound very clean to me but i'm no mechanic. Got any ideas? Appreciated.