Help with 2-3mph crossover (Tip in?)(0% throttle)

Basically its been a while since I've messed with anything related to my tune and I've lost almost all my knowledge on it because of that.

My problem is that when I put the truck in drive and get up to 2-3 mph (giving it no throttle) it just falls on its face, idle drops, sometimes starts surging, sometimes just dies. Same issue occurs sometimes when I come back down to speed in the same mph area. This problem is made worse when the A/C is on. When throttle is given there is no issue.

Other than this one area the truck runs pretty well.

I'm not looking to adjust the tune to any real degree other than to just make this dying or surging point easier to daily drive through. A bandaid is fine I really don't care, I just want it easier to drive for the time being.

At a later point I may want to properly tune it out, but I just don't have the real time or desire to do more right now.

Current tune is attached below.

It is a 1999 GMC Sierra regular cab with a 6.0 lq9 with ported 317 heads, 222/224 .6** lift, full bolt ons, ported NNBS intake, 92mm fast cable throttle body,1 7/8 headers 4" single exit, etc.



Attachment 23476

Without seeing a log of what's happening, I'm just guessing... but try this bandaid.

Please post some logs.

What parameters should I make sure I'm logging for before posting a log?

Should I start from a fresh upload of the tune before the computer has done any learning? It seems pretty hit and miss on whether the computer learning helps or hurts.

You are taking air away as its rolling no throttle. Fix that.

Quote:

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Originally Posted by ProperTuningOG

You are taking air away as its rolling no throttle. Fix that.

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Which area of the tune are you seeing this so I can look into it?

Forgive the ignorance, its just been long enough that its like I'm starting from scratch on most of my knowledge.

Leave all your idle airflow stock for now...... Same with follower and cracker and pids. If you don't understand what a table does, do not change it from the stock cal. Also, the timing tables are a wreck.

Quote:

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Originally Posted by ProperTuningOG

Leave all your idle airflow stock for now...... Same with follower and cracker and pids. If you don't understand what a table does, do not change it from the stock cal. Also, the timing tables are a wreck.

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A lot of the tune was not touched by me but was done by someone on this board a ways back to help me because I didn't know much.

Putting these values back to stock results in a much worse running truck unfortunately.