engine ping then knock on 1995 Chevrolet 1500 Pickup

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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1 answer 1 comment
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