Trouble code

[gman10]

This is what the trouble code delivered:
P0328- The PCM has determined that the voltage signal from knock sensor 1 is too high for the current engine operating conditions.(Bank 1 or single sensor) (Bank 1 identifies the location of cylinder #1 while bank 2 identifies the cylinders on the opposite bank.
My question: while passing the truck shuddered for an instant and lost power, when the speed came down, it continued as if nothing had happened. What do sensors look like and where can they be found? Has anyone else ever encountered this problem?

Thanks
gman10