hey guys once again i need your advice! When i take off from a stop i hear a PING! from the bottom of the car. it only happens when i take off.could this be clutch related? it sounds like theres a midget under the car hitting a pipe with a screwdriver. ok thats one. heres the next q:

after a hot day the car seems to become heavy and sluggish. my vacuum gauge reads 15psi(i had one installed on my N/A vert)but it always reads this.what could it be.are my cats clogged.

last one: my rear is starting to sound like a motel bed during a hooker convention. it makes this sqeaking sound. and i can even make it happen when i get out and shake the trunk up and down.

any help would be appeciated. i might have to sell this car. so if anybody is interested make an offer.