I've started having somesort of a lean condition since I went to the track last week.
The lean occurs after the car idle for 30-40 seconds, goes lean 17-20 AFR then slowly goes back to 14.7 AFR. Only occurs when engine is hot.
I could be driving for a while, get to a stop and problem occurs as well. Also after start.
O2's goes down to 60-70 MV and stay there until lean condition stops.
Check frames 450 to 650.
Thanks for any help.