car seems to want to stall out when driving on freeway on 2004 Hyundai Santa Fe

can be sitting in traffic or idle and car seems to stall out have recently had all 3 belts replaced, replaced spark plugs all over due anyway car only has 80 thousand miles on it, problem there even before these repairs

Asked by for the 2004 Hyundai Santa Fe
Is the check engine on? Check for vacuum leaks as well. I would want to see the data from the engine while running if you have no lights on. We have shops in Dublin, Concord and Vallejo but probably a little too far. GL
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