I have a 99 Corvette with a Diablo tune U7198 9r latest revision. Car runs great no issues , Should I take off the tune and return it to stock before having it tested for smog or leave it alone.
Only thing I have changed is the air cleaner put on a halltech.

over 600 miles and no problems.

Reset , made adjustments and installed tune once again. Drove about 50 miles, in town and on the freeway. So far no problems.

Checked it and found a P1870 code. Cleared the code anything I can do to prevent this. Some additional adjustments??

I will go back through it and check the settings and also check for any codes. Maybe a slip code P1870??

I recently changed gears in my 1999 Corvette C5 automatic from 2.73 to 3.42. Using my U7198 2.13 I made changes to MPH and the gear change to 3.42. It was shifting fine and I thought everything was ok but I drove it on the freeway and when I exited stopped at the red light. When I left the light ...

I installed the canned tune wiith the 3.42 change. I want to be sure all adjustments are in the ballpark area. Does anyone have the settings you are using.

Shift points
MPH RPM etc