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Going to go on experience and say it's the ACT clutch system itself.
Clutch drag is not an uncommon issue among ACT clutches. I had an ACT that did the same, especially after driving a few blocks and warming the system up. My friend had similar issues on his ACT system, and other accounts have been recorded on this forum as well.
I ended up putting the OEM clutch system back into the car, and it drove perfectly fine again.
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Try racing the engine with the clutch pedal depressed next time you're stuck at a light. It can help slip the friction disk away from the flywheel/plate. It's not a fix, but at least it can help you get out of a pinch
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