My 4age 20V is running way way too loaded and gives black smoke through the exhaust. What i also recognized is actually a vibration at 3/4 throttle to WOT with about each RPM. Doesn't sound flywheel connected imo, though i had that issue on other automobiles and it sounded unique. https://caidenujihz.frewwebs.com/29659316/toyota-4age-can-be-fun-for-anyone