i have a 2000 gt, about two weeks ago i heard a tick coming from the motor (sounded like it was coming from the bottom end).. i already knew it was from the plug(s) and immediately checked them, a couple were loose. re-tightened, and tick went away. just a few days later the tick came back, so i pulled the little ****er out and doing so, it pulled the damn threads out with it.. uhg. had it fixed on wednesday (timesert) and just today another one was loose but i pulled it out and the threads were okay.. what should i do?