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Q:

engine ping then knock on 1995 Chevrolet 1500 Pickup

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
my tuck pings then turns to a small knock until you give it more gas i have put in a knock sensor it helped for around 20 miles
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The pinging may be from a bad EGR valve. Any Check Engine or Service Engine Soon Light coming on? I assume that your timing is on the money and that your truck is not over heating. Check out this Article, the CEL is about a problem, not maintenance.

http://repairpal.com/check-engine-light
If the truck is heating up not over heating at highway speed is that a different problem? I have the ping as well