My 4age 20V is running way way too loaded and gives black smoke from your exhaust. What i also discovered is often a vibration at three/4 throttle to WOT with about each RPM. Doesn't audio flywheel related imo, when i had that issue on other vehicles and it sounded distinctive. https://reiddijf06162.bligblogging.com/29659774/5-simple-techniques-for-4age-20v-blacktop