I have been tuned and would like to get something a little more aggressive.
I also have the falling/surging RPM idle.
I have several HPT files that I could upload if anyone could take a look at them and let me know what I could do to eliminate the falling idle and possibly get a little more out of the 2.8 and 60s.

I could also do a new log file and pull the current tune off of the car... but I would need a little extra time to do that as I would need to borrow HPT from my brother. Attached is the HPT tune file that I believe is on the car currently.

Is it possible for the falling/surging idle to be from the tune?

 

Has the TB been cleaned recently?

 

i had the same idle issues with my zzp tune. they make some changes to the idle overspeed and underspeed spark tables, going back to the stock table seemed to fix this.

 

Yeah i've seen errors in that table in some tunes, where the first value will be flipped from negative to positive, causes a bit more surge.

 

Well i havent played with HPT nor have i had the chance. It's my brothers and i only used it to load my tune as i know nothing about it... Looks like i may have to borrow it again and learn some basics...

No... I thought people were having problems even after cleaning th TB.

 

Sure but a dirty TB forces the car to open it more than it should have to, it can affect it at very small openings like coasting down and idle. Doesn't hurt to clean it anyway.

 

Ill dig into that this weekend... and get my hands on HPT to do some logging and learn a tad about tuning.