hey guys i have a 1997 GT with a knock that sounds like it is coming from the left side valve cover but i had it checked and thats not it at lease we think. i can say it knocks loud at idle and if you give it gas to about the 1500rpm range or above it quiets down or even stops. any ideas of what it could be? i was thinking rod bearing or wrist pin. let me know what you think. thanks!