a one time clunky noise and a little jolt... under the car maybe engine

or poss motor mount issue

Bingo....That's what it was, 3 engine mounts to replace the verdict from my mechanic....but he say I can wait.... $400/450 ouch!! Thanks everybody.... now I have a new little problem...the lights are flickering.... even the dash boards lights... Hal... how much do U charge for the job?? I am in Berkeley CA

He's right three mounts cost about $300 and the 2 hours of labor. It'll be worth it!