Ok so it is hot outside maybe this is the issue. However, when driving and the gears are shifting sometimes the car will rev up to 4-5000 rpm before shifting. Sometimes when im on the highway and add gas there is a delay for accerlation. Its definitely a safety issue.. trying to merge on the highway and speed up all the sudden it dosent speed up like it should! wtf? other people get mad cuz it looks like im slowing down but my car isn't shifting right. what could be the problem for this? I scheduled a maintenance appt. This is a 2015 chevy cruze ltz.