Ok I am still trying to figure out this dang rattling under load/acceleration noise. I have gutted the cat, replaced plugs/wires (autolite 606's) and still didn't help. Well this morning I unplugged the maf sensor before I went to town and the car ran perfect. Seemed peppier and made no rattling noise at all. So I went to the parts house and bought a new maf and replaced it in the parking lot and as soon as I did it started rattling again when I got on the road. My car does have a open cone connected to the maf. Any ideas? I'm getting aggravated with this.
