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A couple of things that I do when towing........I have a little heavier load. but take it out of OD when towing.....unless you are on flat ground.

The next thing was when was the last time the plug wires were replaced, my wife's blazer 95 4.3 with 160K had a similar thing when you can on the flat in OD found that the wires (not really that old) was losing conductivity. A fresh set changed the whole running picture.

Worth a try???
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