[fastfredracing]

I get them at work all the time , customer comes in telling me that on Tuesdays, when it rains and the rolling stones is playing on the radio at 9:37 pm their car makes a funny noise . I am limited to only a test drive, check codes, look for the obvious, and a lot of times, not much you can really do until I catch it in the act, or it finally goes kaput .
We just got back from a camping trip in the Pocono mountains . Beautiful place .
Towed heavy all the way there. Last night, we went up to check out a few lakes , and on the way back, cruising at about 45 mph no load, no trailer on, all of a sudden, feels like I have no power . I start pushing on the gas, and sure enough, truck is barely running, All gauges look normal, no check engine light, but battery light is on. Voltage gauge shows better than 14 volts . Turn down radio, and tell family that , oh crap, we are 500 miles from home, and are breaking down in the middle of no where in the dark . Truck is still running but when I push on gas, truck starts knocking and making all sorts of horrible noises that I have never heard this truck make before.
I coast a bit while idling till I can find a safe place to pull over . Shut down, open hood, check all fluids, check for codes, look for any misplaced wiring, or damaged belts, hoses , foreign debris , and nothing, nada . It was not in limp mode . Attempt to re-start truck and it fires right up like normal, and runs perfect for the entire 40 minute drive all the way back to our campsite .
Came home today, 5 hour drive towing 10k in 90 deg, heat, and the thing never skipped a beat .
I am towing 1200 miles in a month from now , and I have lost some confidence in my setup . Although I was happy to make it home, I would have rather just broke down, and known exactly what was wrong . When is it going to happen again? You can be sure it will not be anywhere near home.
I suspect my tuner is on the fritz, and I was looking for a good excuse to upgrade anyhow , but there really is no way of knowing . A quick google search shows some similar failures in high heat situations .