So I finally figured out that the park/run IAC offset was too low and added a few steps. Now it idles at 765 regardless of gear selector position. I guess with it too low, the ECM was giving almost...

so here's a log file from today. I still get a little bit too much idle in park/neutral after driving. I'm looking for 750-800 rpm and its in the 900 range. Any ideas?

Done, thanks. Now to get a day off to datalog! BTW, for highway spark advance, to add 2 degrees, which table do I adjust?
I see 2 very similar tables and I don't understand the difference:
"SA -...

Thanks Dave W. Being a newbie at it I'm wrapping my head around understanding the adx/xdf, what they do and which to use. I'll load them up, do a log and repost if that's what you're suggesting I...

Hi,

Anyone willing to view my Tunerpro RT datalog and help me isolate the parameter(s) that might be affecting my park/neutral idle speed?

I have a 1988 Chevy R20 with 454 (7.4l).
TH400...

Looking forward to getting help first, then becoming proficient enough to help the next newbies...:)

I'm Dalton (or SgtBilko)
My ride: 1988 Chevy R20, 3/4 ton crew cab with TH400 3-speed auto...