Hey Scotty, my 1999 mustang GT is having a problem with the idle, it will sometimes idle at a set…

Hey Scotty, my 1999 mustang GT is having a problem with the idle, it will sometimes idle at a set rpm but then at stoplights sometimes it will go and surge between 500 to 1k rpms, I have codes for the o2 sensors running lean. I also noticed that I don't have a grommet for the pcv valve and I have a small exhaust leak from where the longtube headers go in the car. I'm going to get fixed soon but I just wanted your opinion.

Thank you!

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