Y_not

I recently got my truck back together and tuned after doing cam swap (223/232 113 .600 TSP) on my 09 6.2 Silverado. The shop I had tune it is a reputable shop in the area, idles great, runs great haven't gotten on it much since my tq converter is still under break in period. The problem is when I am cruising, the truck jumps up in RPMs on and off. Is this a tune issue or something else going on? I linked a video showing the RPMs jump below. https://youtube.com/shorts/m_B1g5gKKAo

madmann26

iTrader: (7)

I mean the check engine light is on……why?

Its very possible it’s a tune issue.

timharber

Might be the converter locking and unlocking. My tuner did something so that my converter would bot lock up until 4th gear.

Tim

BigKID

iTrader: (5)

What aftermarket converter is it? Most aftermarket TCC can't handle the programmed TCC slip in a stock tune. Have your tuner make sure all TCC PWM (slip) is removed. Hopefully you haven't already burnt up the clutch in the new converter.

madmann26

iTrader: (7)

Something else crossed my mind,

When I still had my 60e, something similar happened to me.

I pulled the pan off to find that the builder didn’t properly seat one of the solenoids.