Hyundai Elantra Engine Noise

Recently I Accidentally Left My Gas Tank Open In The Rain For About Twenty Minutes. I Am Not Sure If Water Got In It Or Not But Ever Since...

When I Go To Stop And Sit At A Stop Light There Is A Knocking Under The Dash Board Right Where The Steering Wheel Is. Plus When You Lift Up...

So, I Replaced The Radiator And I Forgot To Clamp Down One Of The Hoses And It Leaked Out And The Engine Overheated. Now I Have A Knocking...

Hi I Have A 1995 Hyundai Elantra (j1) And Whenever I Start The Car Up, A Loud Vibrating/rattling Noise Comes From Somewhere In The Engine...