Something to remember is that if you have a misfire it will read lean on the 02 sensor. So if you have a misfire it is possible the "auto tune" will add fuel and make it overly rich(smoke).
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
