ok guys i know its knock i have to be hearing im curious as to why im hearing it.  i can hear it on both shift points and on the very top end with my foot to the floor.  here is what i have done so far......new knock sensor, new plugs, new wires, new MAF, new EGR, power plate,  new coil pack and module, new fuel filter,  and maybe another thing or 2 that i cant remeber.  this has been happening to the car for a long time i think.  ok ehre is the rest i am runnin 16-17 psi with sunoco 94 and 1-2 gallons of xylene and it still does it.  i am getting fuel up top as i have checked that.  im running a thrasher 92 with 45psi at hte rail.  i did notice that the cars seems to knock after its been running for a while and i know i have a bad radiator in the car could it be over heating??  i also have a slipping tranny could this casue it between shifts??  could my stock injectors be clogged even though ive run xylene alot. any ideas on what i am getting this?????