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sounds like you're having a problem with your valves. they are probably sticking once in a while but under the stress of the load, you're probably experiencing the complete effect of the problem. That is the same problem I encountered with my 98 suburban. I would also here some pinging while pulling a hill. Get a diagnotic check and go from there. I replaced with crate motor and I love it. Hope this helps.

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Q: What would cause your 1993 Suburban 1500 lose power while towing a trailer?
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