Spark plug wires changed 3 times in 6 months - what could be wrong?

I would find a new mechanic.

I recommend against going to ANY of the chain, franchise or department store type repair shops.

Many times they're staffed with young kids with minimal training and more trained in selling than anything else.

Get a personal referral to an independent auto repair shop and let them fix your truck.

No vehicle should ever go through three sets of wires in six months, not even cheap wires.

Your issue with power could well be a bad catalytic converter and any competent mechanic would have caught and repaired that problem.

Jonas is on the right tack!

Want to check for bad wires yourself? get a spray bottle filled with water, and one dark night with the engine running, lightly spray the wires near the plug ends. If they are bad you will see a neat little fireworks show! (not dangerous, just arcs).

Original equipment GM wires properly installed and routed using the proper insulators and holders and clips is the best way to go. Also, many times the wires are not pushed completely down onto the plugs causing premature failure.

I own a shop, and also umpire college baseball. In baseball, "three strikes you're out" I would expect my customers wouldn't give me a fourth strike either!

you definitely need to find a much better mech. no way you need to change wires 3 times . no way. it is something else. if you are only lose power when climbing up grades. You might have a clogged fuel filter that will not allow enough fuel to eng under high power demands. or maybe a weak fuel pump. they can test the fuel pressure to find out. could be a clogged catalytic converter , etc find another mech. replacing wires is not your answer. And Pete gave some good advice about the chain store shops.

The engine should be grounded to the frame and the body of your 2500, and likewise the body and frame should all be sufficiently grounded (clean and tight) to the engine. Also, when the plugs and plug wires are changed the anti-seize lubricant put on the plugs should be the correct type (allows the plug to ground to the cylinder head) for a proper spark. You did not mention the condition of the plugs so i will assume that they are in decent shape.

Spend the extra cash and buy yourself a set of high performance/ extreme duty plug wires, with a good warranty, so that you can take advantage of this in the event it still occurs...

Yes, it sounds like your repair shop is misdiagnosing your problem or they are missing the

reason why the wires are going bad. A hole in the exhaust manifold or exhaust manifold gasket

may be melting your wires. If I were you, I would explain all of this to a reputable mechanic and

not go back to the parts replacer.

Good Luck.

Usually the cause is either cheap plug wires, or bad spark plugs causing the plug wires to have to carry too much current.

well one reason for that is a surging distributor, if i was you id stop buying plugs over and over buy a new distributor, new wire set and new plugs. and see if that fixs the problem

You possibly have a shortage somewhere in the engine.