Howdy yall, I own a mint 2002 1500 quad cab SLT, but I'm having two issues with it.
The first one is that when driving on the highway, the "low coolant" lamp will pop on just at random. The temp gauge is perfect. I pulled over at a Walmart and checked the coolant level, looked down about 2 cups but otherwise was fine.

The second one is, when up to temp and idle, also at random, it'll drop RPM down to about 500, no stall yet, but still sounds rough. For this one I'm thinking I need to clean the throttle body, I try to run through a tank of premium every once in a while, not sure if related.

So far there's been no smoke out of the exhaust, or any puddles on the ground.

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This is her, my late grandfather's baby.