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Where is the pressure being measured? If pressure doesn’t change then you haven’t found your smoking gun for injector duty cycle. Assuming the measurement is at full throttle/load.

You keep saying "Nathan Wei harness" like it means something. I had to do an internet search to see it appears to be a made in China harness.

Tune non-WOT areas with narrow band fuel trims.

But at least he attached a log and tune.

I thought some of you pro's might get a kick out of this.

"Tune needed
2011? needing base tune or more if anyone can help?

Previous tuner tuned the car so well it grenaded the motor 24
Hours...

Fuel pressure on the old pump shouldn't have been more than "58ish".

Doesn't sound like it's actually autostop mode in what I think of as autostop (shutting off at redlights). Maybe just something in a left over piece of code that happens to pop up on an unexpected...

"I have been playing with off throttle timing by lowering it in an attempt to get a mean burble from the exhaust on deceleration or coasting"...

The repository only has what are supposed to be stock files. How do you know what you found isn’t stock, or did you just not find the configuration you are looking for?

I think somewhere in here he has swapped to another adapter, not that it really matters.

Injectors?

Since you didn't say you had, did you check the HPT tune repository?

It was just a random guess only. If he had used the Magic 8 Ball instead of the crystal one, it would have probably been right.

Doesn't mean they are snapped on good.

He reposted in Gen 4.

I think you need to black it out and paint an 8 on it. Although the younger users might not get the reference.

Without the tune and log it will be a wild a$$ guess. To many possibilities outside of the tune that will make it randomly "break up" to do any good throwing out guesses.

Search on here for 01d030b shows those as crappy injectors without correct data.

And what is the part number on the injector.
Tuning Lesson 1: In GM tuning, injector data is all important and is far more than just flow rate.

Does the car restart when you take your foot off of the brake pedal?

The 6 credits will be for if you want to tune an unlimited number of 2001 Silverado's, not just your single vehicle. Just the one vehicle is 2 credits.

Opps, I was thinking backward.

Because when you hit a rev limiter it will see it as a misfire?

So, who is tuning this? Multiple tuners working at once isn't going to work.

If it was tuned with incorrect injector data and then the injector data was corrected, then it has to be retuned...

What is changing the OS going to prove about a possible bad ECM anyway?