[wiswind]

I am not sure if the '95 has a knock sensor.....I think that it does. I DO know that the '96 and newer ones do.
I would try running to succesive tanks gasoline with fuel system cleaner. I would use either Redline Complete Fuel System Cleaner (1 bottle) or Chevron Techron (2 bottles). You have either a 20 gallon tank, or the optional 25 gallon tank. The cleaner will clean your injectors and valves.....It will help with carbon build up....but not much, if you have much buildup.

Also, look for anything loose, such as catalytic converter heat shields. I had the insides of one of my converters come loose and rattle. If the rattle happens at idle.....a careful listen around may help....but only at higher rpms.....kinda hard to track down.

Hopefully you have not had the coolant level dropping in the overflow bottle....which would lead you to suspect internal engine items...such as bearings, etc. (coolant in the oil).