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Under any load with light or moderate throttle, the six is pinging light crazy.
Used some 44k, no help. Went up to mid and even hi grade gas, no help. Does it in the winter as well as the summer.

Any thoughts or suggestions?

Thanks!
 

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seems the best fix for this is to replace the coolant thermostat to a 185 degree F.
also flush system if coolent is brown and keep coolant level in the resevoir tank almost up to the black top
 

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Replace plugs. Look for carbon build up, and remove if necessary.

Check timing.
 
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