weird thump noise and code 14

[|WYG|SS]

i got a 91 sunbird 2.0l tbi ohc. tonight i go to back out of my spot in driveway and i hear a loud thump and i get out look around nothing on ground could make that noise so then i open hood then try to shake engine to see if posible mount failure and then i start shaking which it wont really move then car dies so i go start it up again and it runs fine just that it is in a non normal idle (low) sounding so i look if ce light is on and it is so i go use the paper clip technique and find out wut the code is and it is throwing a code 14. which says something about a temeratur problem, i had all the sensors replaced 2 weeks ago and ne radiator put in. i go to pull it back into my spot the rest of the way and im going over a little bump and car doesnt want to idle over it and im actually roling backwards little by little and now im hearing a little clicking noise whcih is kinda faint over the engine which i never heard before. do u guys know wut could be wrong?