Trouble code indicates knock sensor. This happened once before about 2 years ago so I pulled the sensor and cleaned the sensor and the harness with carb cleaner and then no more problem. Currently the harness connector has broken connector clips but it seems to fit tightly and I have used tape to insure it won't fall off. Do these sensors go bad very often or get dirty or could it be something else. I run regular unleaded but have done that along time due to the price of gas. Car may have a leaky intake manifold-could this cause a knock sensor problem? Any test to determine if intake maniford leaks? Thanks

Knock sensors don't go bad very often. Any GM dealer parts department can get you a replacement end for the wire harness. If it'* all busted up you should replace it just to be sure that the harness end isn't causing the problem.
They call it a knock sensor pig tail harness.

Knock sensors aren't much money. Make sure you install it with some RTV or similar to insulate it from rattling. This can show up as 'false knock'.

At this point, I'd be tempted to change the pigtail AND the sensor.

Not a bad idea, if the sensor terminal shows any signs of corrosion then definately replace it. And with the connector being broken I wouldn't be surprised if moisture got past the weather pack seal.

I'm not sure on a the 92, but my 98 has two knock sensors. One on each bank.

Cat, only one on the Series1, and it'* located on the rear bank.