Not sure what an IAC valve is, but I replaced the spark plugs and the wires and it just continued to get worse, so Iknow it's not the plugs or the wires.
I found this on the internet and it sounded EXACTLY like the problem I'm having.
Always run a scanner first to see if a sensor is causing your problem. I recommend that you change the transmission fluid about every 12,000 to 15,000 miles. These transmissions can develop a symptom called torque converter chatter. The vehicle feels like you are running over railroad tracks when the torque converter locks up between 35-50 miles per hour. There are also valve body recalibration kits you can have installed to help prevent this before it occurs, or while your transmission is being rebuilt. The manual lever position sensors like to go bad on vehicles with these transmissions.
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1995 Silver Frost Thunderbird LX
3.8L V6
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