I've been having exhaust problems with my 93 Toyota Camry and shakes while running. A few weeks ago I noticed the car started sputtering while idle and felt as if it was about to die. I took my car into my local shop and they said nothing was wrong--checked all the plugs, wires and hoses and did an oil change. I thought maybe it was just the exhaust, that is until my car started dying at stop lights. It would die as soon as I started accelerating. I noticed white smoke coming out when it died. After turning it off, I was able to restart it and was running fine enough to drive home. I'm scared to stop in it for any amount of time. I noticed the check engine light did not come on at all.I checked the fluids hand were fine. The smoke came out of the right of the hood. It happened briefly. What could be wrong?