Just finished up my fummins build and aside from the torque converter not locking up and my map sensor saying I have 12psi at idle everything is fine lol.

 

However on my drives to work at around 30-40 mph the truck has a slight bucking or chugging that's not terrible but enough to be an annoyance.  It goes away as I accelerate a little but if i'm just cruising along at those speeds its pretty constant.  If i increase my power level to one of the higher settings on my quadzilla its less noticeable. 

 

Any ides what could be causing this?  I have done and custom calibrations to the V2 quadzilla tunes, they are the basic tunes that are preloaded.

What size injectors are you running?

stock size

Is it still present if you drop to Level 0 on the Quadzilla? (Quadzilla turned OFF).

 

If so I would talk to @Me78569 he's the Quadzilla guru here.

 

If not I would consider that AC noise test for the alternator. Could be excessive AC noise messing with sensors.

I will check this on my lunch today and reply back

So on lunch today I had my Quad at level 4 (base loaded cals) and starting at 40 mph with a slight accel it would start chugging a little.  Set the tune to level 0 and it went away completely.  I'm guessing the base cals need to be tweaked a little for my application or the fact that my map sensor is always reading 12psi or higher all the time is causing a fueling issue.

I would guess your issue is related to the map issue.  wihtout a good map readings you are gonn ahave issues

Thats what i'm thinking too.  I'm gonna get a new sensor first before I start messing with anything else.