As the title says, I know these mounts aren't What is usually seen on this forum, but I installed a set of Solid polyeurothane Energy suspension engine mounts(all 3) But since I've installed them I get a weird, LOUD knocking sound when I accelerate. If I accelerate from a stop or shift gears, or let the engine decelerate while still in gear, and then tap the gas, the weight transfers and I get a loud THUD. I have Checked and rechecked the bolts, and all are tight. The only thing I can figure is that it is something completely unrelated and just a coincidence, or maybe the passages through the new mounts where the long stud goes through are slightly larger than the stock ones causing a small amount of play. I've checked all my suspension components, and all seems tight, also had that checked by a tire shop. Any ideas on what the sound might be from, and how I can fix it without putting the stock mounts back in?