I am tuning for the first time. I got a base file from wait4me, and the car seems to run OK and idles OK but surges or bucks at light loads. The idle surges sometimes after a throttle change, and will surge excessively and sometimes die after shifting gears setting still. It is a 98 Firebird with a GM Hot cam. I tried messing with RAFIG, RAFPN, but when I set the air flow in p/n to get a zero RAFPN, it won't idle in p/n but is OK in gear. When it does idle OK in p/n RAFPN is abour -2.35 gms/second.
Also, the desired idle warmed up is 750 in gear and 800 in pn, but the car idles about 100 rpm higher than that according to the scanner data, and IAC counts are not changing to fix it. I was under the impression that idle speed was controlled by IAC and timing. What do I have to log to verify what my problem is?
How can I fix these idle swings?
So many questions.