Chevy trax 2016 LT engine surging with AC on, no check engine light
Mileage about 87k. Automatic. AWD
My car has been doing weird engine surges and i believe the RPM will go up with it. Its like a weird shuddering and mostly will occur in stop and go traffic or idle/at a light and after i get gas. Its worse with the AC on. I got my CAT replaced maybe 5 years ago already and it doesnt seem like that. Every once in a while, not often, the engine will lurch after tapping the gas from a low speed and the acceleration has never been the best but seems to be worse. I took it to a shop and they did a fuel line cleaning and replaced the spark plugs. I took it back they said they feel nothing and that i would just be throwing money at potential issues because they dont know what it is. Today i took it to another shop and they also didnt experience an issue upon test driving. It doesn't happen all the time but when it does happen its obvious and i know im not crazy bc my bf is afraid to drive it with the AC on and when it does happen again its very prominent. Im going back tomorrow morning to do a test drive with them but just wanted some help to know some possibilities on what to tell them?