I just got my opti fixed and new i have a low rpm miss , at idle or low speeds 0-5mph, my rpms will start to dip and rise between 1k- and almost 2k rpms, then stall on me. It does this all the time at idle and low rpms. Is this caused by a Vaccum leak? or what? anybody know how to diagnose this problem or give me a way i could check over things to see? I really appreciate it im fairly new to this engine.

 

Can anyone help me?