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308 Posts
Go figure while I'm deployed, something goes wrong with the truck that has never left me stranded in the last 4 years.
Cliffnotes: Truck stalled at highway speed. No CEL. Cranks and fires, but only about every 4th attempt. Once running, it's idling lower than normal, with fluctuating RPM. It usually stalls within a minute, or will stall if you put it in gear. I've researched a bit on here and most everything points to IAC valve, but I wanted to see if anyone else has a different opinion before I start ordering parts for it.
My dad was driving my truck at highway speed and said it very suddenly lost power, and wouldn't maintain RPM regardless of throttle position. Luckily, he was able to pull over on a runaway truck ramp. He could restart the truck, but he said it wouldn't stay running and had a rough idle.
After being towed home, I had my wife take a video (posted below). I have had her and my dad check the intake and all vacuum lines for leaks, and they couldn't find anything. I've had my intake separate from the TB before, and it also ran roughly, but it was still drivable at low speed.
I had her tap on the IAC with a hammer, and no change.
Mods are: K&N intake, SCT MAF, SCT XCAL3, Accufab TB (.99v TPS), ported Eaton, 4# lower, LT headers, mid pipes, catback.
What does the collective genius of LR think?

Cliffnotes: Truck stalled at highway speed. No CEL. Cranks and fires, but only about every 4th attempt. Once running, it's idling lower than normal, with fluctuating RPM. It usually stalls within a minute, or will stall if you put it in gear. I've researched a bit on here and most everything points to IAC valve, but I wanted to see if anyone else has a different opinion before I start ordering parts for it.
My dad was driving my truck at highway speed and said it very suddenly lost power, and wouldn't maintain RPM regardless of throttle position. Luckily, he was able to pull over on a runaway truck ramp. He could restart the truck, but he said it wouldn't stay running and had a rough idle.
After being towed home, I had my wife take a video (posted below). I have had her and my dad check the intake and all vacuum lines for leaks, and they couldn't find anything. I've had my intake separate from the TB before, and it also ran roughly, but it was still drivable at low speed.
I had her tap on the IAC with a hammer, and no change.
Mods are: K&N intake, SCT MAF, SCT XCAL3, Accufab TB (.99v TPS), ported Eaton, 4# lower, LT headers, mid pipes, catback.
What does the collective genius of LR think?