i need help! when i start the trep, it sounds like a monkey is banging on the motor with a hammer, and it continnues to rattle while in park. if i tap the gas, shift, or otherwise change the rpms, it will stop. she has 96,400 miles, so i need to do the 100k stuff soon, (water pump and timing chain) could the sound be one of those? and today, i noticed that she was running a little warmer than normal. so thats why i think it could be the water pump.