You know.....I don't know why I torture myself sometimes lol. Remember using this stuff once on a '98 v6 Mustang and it destroyed the MAF. And yes, I am following the instructions one too many times to be sure. Leave it to me wanting to experiment gimmicky products on my car and not learning my lesson, threw some Seafoam into the throttle body on my '05 4.6, all seemed well so it seemed. After can emptied, shut the car off waited 10 minutes to then start it back up and vape out my neighbors and I was met with P0330, a knock sensor code. Car has no noticeable performance loss, fuel mileage decrease, or knocking/ticking/pinging and yet, regardless if I clear the code it comes back almost immediate. Wondering if anyone else ran into a similar issue and if replacing the knock sensor solved the problem. Cheers! Car is practically stock; MSD coil plugs, runs 89, 40 series flowmasters, bout it.