Yes, this is a TB/Throttle position issue.
"Quote:
The MAP is greater than 65 kPa
"Quote:
The predicted throttle angle does not match the actual throttle angle
Quote:
All conditions present for 20 seconds
Now, that 65kpa map figure comes into play in nearly every LS1 Car/Truck because its the max map setting in most of the calibrations for the sanity test as shown here"
Now there is a screen shot of a HPtuner screen showing the values of MAP range and where you might adjust this...but here's the link to the page.
http://www.ls1.com/forums/showthread.ph ... ight=p0121
And here's the link to HPtuners for p0121
http://www.hptuners.com/forum/showthrea ... ight=p0121