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I know that I posted this forever ago but I figured out what this was and I was able to fix it today. So for the sake of anyone else looking for this I will post the information.
After doing some talking to a older mechanic he suggested that I check my Transmission Vacuum Modulator. So I found it in the car (It sits right under the air box and is taken off with a 13mm bolt) and I took it out. Not only did it not have any O rings that the new one had but it made a awful clunking sounds then and the end that controls the shifting was just ever so slightly hanging in . Also the hose that connected the thing was all tore up. So I replaced the part and the hose. And now the car runs amazing and I no longer have this problem on the highway! I took it out for a few test drives and never once did it do this! So If you have a problem like this with your car go ahead and try it. The Mechanic that I had talked to said you should change them every 30 to 40 thousand miles. It was only 12 bucks so no big deal if it doesn’t work.I wouldn’t exactly call it a maintenance item but I’m glad it fixed both problems. Thanks for the update.
If the torque converter clutch is acting up it could be because of an internal seal failure or some electronic failure, OR it cold just be worn out. Torque converter problems can cause performance problems such as hesitations and stalling. Changing the fluid usually doesn’t help, putting additives in the transmission usually doesn’t help. The best way to verify this problem would be to hook up the proper pressure gauges and compare the pressures observed to spec, if they’re out it could mean a transmission overhaul or replacement.
If it were me I would not worry about the coolant or anything else until I determined what was going on with the TCC, if you end up needing a transmission or transmission overhaul then you would need to consider if that investment would be worth it or not. If you invest in a bunch of other things and THEN find out you have a transmission problem you’re already committed.
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