I'm still going through a bad experience with a tune from Will at Overkill. Long story short, I'm experiencing two issues with the tune: surging idle after cold startup for approximately 2 minutes and shifts that are firmer than what I prefer.
Overkill's website says that all of his tunes are editable with HP Tuners software. Although I don't have HP Tuners, if I find someone who does, can we open and edit the tune to make changes?
Any idea what could cause the surging idle? My stock PCM as well as the DHP PCM I sent him did not do that. I've put the stock back in to confirm that the issue is in the PCM. I'm at a loss...
My mods: 2002 GTP, 3.4", K&N cold-air, ZZP headers/downpipe/high-flow cat, port LIM & 180deg stat
Brent
