Diablosport Forums

This is interesting as I have been running your tune for a few years now. Both 87 & 93, however an issue started a couple weeks ago and I am perplexed. The only change I make is to raise the RPM 250 - 300, which was working well. Suddenly it is idling rough, especially in drive and the rpm's jump from 400 - 800 at a stop light and the AC kicks on and off. Naturally I changed the filter & cleaned the throttle body with no luck. I restored the factory tune and it idles smooth and the AC doesn't switch on and off. The problem is that I need the extra RPM's so I don't get the oil pressure warning at a light.....and have to listen to my wife.

The minute I put a tune in it acts up and the RPM's flutter at idle. Presently it is filled with 93 octane but I have tried all three tunes (modified stock, 87, 93) with a 250 RPM increase programmed in and the idle goes crazy. the up and down isn't as bad in Neutral but it's big in Drive. Thoughts?

I forgot to mention... no codes.

Out of desperation, I changed the throttle body and the issue went away. I just can't understand why this only happened with the tune installed

well, makes even less sense if replacing the TB fixed it....not sure here.