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?????