问：汽车rpm上下上下...斯托特... idk怎么了

嗨，我的车表现很奇怪。没有检查引擎灯。汽车确实闲置了。RPM上下下降。当我拉开时，它确实结结巴巴。有时，感觉就像是跳过一点。我当时在想这也许是凸轮轴和大规模气流。有人告诉我这可能是一个传输问题。但是，没有灯...它只是怠速高，然后又高。它上下下降。 And it jerks at times when pulling off. Like it's an acceleration probably possibly. I was going to get the transmission tested to rule that out but then what's next? I don't smell anything...it's not a specific time it does the jerking. It can be warm or cold outside. It has a mind of its own. The way the rpm goes up and down it seems like I'm stepping on the gas a little but IM NOT. I don't hear anything weird. All fluids are clean and new. I had a tune up maybe 20,000 miles ago. So I really don't know what the issue is with the jerking and rpm going up and down. Some sort of acceleration issue maybe. Please help!

我的汽车有185000英里。
我的汽车有自动变速箱。