Can you guess whats wrong?

[McMx5]

I feel like a broken record on this forum. I realized I wasnt going to get my tune figured out as quickly as I wanted so paid a somewhat local guy to send me a tune. I had already bought a mpvi3, credits and licensed my pcm so he adjusted my tune remotely. I waited a couple days for the tune, then he sent it this morning. Its not much better than what I already had. Im getting a lot of stumbling at low/mid acceleration & small backfires/pops at about every other take off. VCM scanner shows Im running lean I believe, I'm not sure im even reading the graphs right at this point. I contacted the tuner but have yet to hear back from him. I couldnt find anyone local to set my tune which is why I bought the mpvi3 in the 1st place. But I'd like to drive my truck without stumbling & backfiring.

1) Does anyone notice anything off with my tune and/or log?

2) I have tried MAF & VE tuning before I bought a tune but apparently I was doing something wrong because I couldnt get it to work for me. If I bought a wideband, would this make the process easier?

2002 5.3 DBC, 218/224 .553/.553 110lsa cam, long tube headers, 2800 stall

[blindsquirrel]

Is this a swap vehicle? No cats? No EVAP stuff?

[McMx5]

Correct. No cats, no downstream o2s, no egr, no evap

[blindsquirrel]

Give this a try. No guarantees. It's not gonna do great until MAF & VE are tuned, but I mainly just fixed up those awful main spark tables. Good Lord.

brandon 2002 5.3 LM7 with BTR Stage 3 1st tune - newspark.hpt

[McMx5]

I greatly appreciate it. I'll see how this works for sure. For the MAF & VE tuning, no wideband, do I disable DFCO, COT, PE for both MAF & VE tuning? then obviously disable MAF for VE and vice versa. Ive also read to disable LTFT while VE tuning but I thought thats what you use to make adjustments so Im lost on that

[5FDP]

Get a wideband, it's a must have thing.

[blindsquirrel]

You can't disable fuel trims for tuning without a wideband, otherwise you'd get no data. That only works (and is mandatory) when tuning with a wideband.

There are filters you can use to exclude data for when it's in PE or DFCO or other stuff, no need to turn those things off. Just filter them out.

[McMx5]

Wanted to give you an update. That spark table adjustment felt a lot better but I was still getting a lot of stumbling & backfires. I did a little digging around this morning & found I had a plug wire with a little gouge in it so picked up a new set of wires & it made a world of difference. Very little stumbles & no backfires. Fuel trims are still lean but not as much. Im going to work on dialing in the MAF & VE now. Tuner also contacted me to let me know hes out of town for the holiday & will work on it when he gets back. I do have a wideband ordered, just waiting on delivery. Im having bad luck with packages lately so who knows when that will be. Hopefully I can make progress now until that comes in

[04silverado6.0]

Here is a startup i did for a dbc manual shift 5.3 with that same cam. You may try to steal the ve table as a starting point. It started up and ran very good on the test fire just a couple days ago. Make sure to use the stoich value as well as the ve.