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92K miles - you're still breaking her in!
Is there any reason besides gapping that you are looking for an alternative to the AC-Delco plugs that are OEM for your burb? I've heard mixed opinions on the Bosch. I've used the platinums in my last Suburban, but the best performance the I've gotten has been from the OEMs. Just my two cents on that, I'm sure I'll have some disagreement out there. Certainly, when you get to the ignition wires, distributer cap and rotor, I strongly recommend AC-Delco and nothing else. As for the air filter, I've never really had much of a preference myself.
Ther real reason I replied was to address your coolant leak question and your steering question. My current burb was losing a very small amount of coolant - the the effect that I had to add a quart or so every few months. While chasing down a misfire problem, we found the coolant leak to be in the intake manifold gaskets. Even still, no spark plugs showed signs of fouling. Keep this in mind, unless you're actually leaking around the pump.
The steering - if the problem is that it's feels tight, as if it's stuck, then suddenly frees itself (I'm trying to interperet klunk feel), then your problem is most likely an electronic part at the bottom end of the steering column - I believe it is called a steering position sensor. This is part of the speed controlled steering system, and apparently it is a common problem - or was. I replaced it myself and the part was around $60, dealer only. Not a difficult job if you are mechanically inclined enough. I think if you searched these forums, you'd find a post with the specific replacement instructions.
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