I have a 92 Plymouth Voyager and out of no where last night the engine started making this thudding sound. When I started it today the engine and the car started shaking and when I went to shift it stalled so the only way to keep it running is to keep the engine reved. And I when it is in drive and I accelerate huge clouds of smoke come out the exhaust. I have no clue what's wrong with it! PLEASE HELP!!!!