Please excuse me if this is a stupid question. I am tuning a 98 vette. 23x, .59x, 114lsa, ported 243's, 90mmls2 tb, fast 90.
The car runs great, everything is perfect, follows the commanded afr as per wideband.
Here is the issue, at idle it goes nuts and dies at stoich. If I command 15.7 it idles beautifully. The only problem is the stft's keep adding fuel to get it to 14.68 and it starts surging until it dies. This thing otherwise runs perfect but will NOT idle at 14.68. At 15.7afr per the WB it idles awesome. I have tried everything I can think of.
20deg timing at idle, more or less and it gets worse.
I guess the question is can I get it to idle at 15.7afr? If not what needs changed to make it idle at 14.68? Base airflow? Tried that, but I know I have to be missing something.