I have a 6 cylinder v6 ford taurus. I put new spark plugs in my car yesterday, along with spark plug wires. My car has been shaking and making an odd clicking sound when put in reverse and when in drive. It has a full tank of gas currently. Today just a few minutues ago after the car came to a complete stop at a stoplight it would make a screeching sound, and then the engine would stop. I would turn the car over, give it gas and eventaully it would slowly "chug" along. I am not sure what to do from this point after putting in new spark plugs. Can someone please please help me diagnose what is wrong, and I will happily give more information if needed. Thanks.