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I have a 95 Chevy 1500 suburban with 94k miles.
350 motor.
Second owner.

Truck runs well and shifts well under normal conditions.
Just bought a 18ft pop-up camper. Camper weighs 2500 pounds unloaded. While towing up a grade on the highway using the cruise control, transmission downshifts to maintain speed and causes engine to stutter, sputter, pop, lag, and lose horsepower. Once past the hill, the engine runs fine and trans shifts back into overdrive.

Solutions: (I've tried)
I checked timing since a friend suggested spark-knock. The timing was advaced on this truck. Upon setting it correctly, same problem results, but with less frequency and only after the 3 hours of driving at operating temperature.
Next I flushed the cooling system.
I had the transmission flushed and new filter installed.

I need advice on what to check or replace next. I am thinking that a tune-up might solve this issue, but wanted to check with others before doing so.

Thanks for reading.
If you're running a '95 with that many miles I would definately suggest that you do a tune up.
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