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Car: '99 volvo s70 awd with 126k miles
Problem: The last couple of times I've been driving on the freeway, I have had random surging with the car as I've been cruising at about 60-75 mph. It happens in the 2k rpm range, the rpm will go up 3-500 rpm for just a moment then drop back down, and do this for a few minutes of driving before going away again. It makes me a little uncomfortable on the freeway as it almost feels like having the ETM going out again. I am highly doubtful of the ETM though as that was replaced by the dealer about 5 months ago and the car drives and idles fine.
Question: It kind of makes me think that the tc is going in and out of lockup, so maybe the SL solenoid is going out? I also doubt that the transmission itself is going out as the fluid looks good and is shifting and driving like normal when this problem isn't occuring. Any ideas?
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