1992 Olds 88 "dieseling" sound when going up hill??

I have a 1992 Olds 88 with 135,000 miles that I have owned for 6 months. It runs great but when ever I go slighly up hill the engine will make what I call a dieseling sound (or a real fast pining sound)for a few seconds.
It doesn't seem to affect anything but I know that this is not normal. Any suggestions as to how I can fix this?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
wrote:

1) Combustion chamber conditioner (follow instructions on can) 2) or a slow trickle of water while the engine runs at a fast idle (slightly more risky but usually equally effective)
Ideally,
Remove cylinder heads, wire brush cylinder head and piston crown, grind down any sharp edges, re-assemble. flush coolant system install new thermostat. buy premium grade gasoline and enjoy.
If it were my car... based on age and mileage I'd almost be tempted to try the water or combustion chamber conditioner. Some in the group might even recommend taking the car on a good long hot fast run. (also works in some cases). Though potentially more expensive :)
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
What engine is this?
Usually this is due to either the knock sensor not working (if it has one), the EGR system not working properly, or maybe carbon buildup in the combustion chambers.
--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from snipped-for-privacy@nospamshaw.ca
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

It's the 3800 V6.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.