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Hyundai Tiburon and no acceleration on hot days

So I needed to have my clutch and slave cylinder replace on my 2000 Hyundai Tiboron about a month ago, and now I’ve noticed that in warmer weather the car totally loses acceleration. I took it back to the mechanic who had done the clutch work, but of course he couldn’t reproduce the problem and had no idea what could be causing it. Yesterday afternoon when it was 80+ degrees I saw the problem again, where I could push down on the accelerator and the RPMs would jump from 2.8k to about 3.8k and very little power would be transfered and very little acceleration. I then checked the car this morning while it was cool outside, and even after driving 30 miles to work over a mountain, the car had proper acceleration. So anyone got any ideas on what might be causing the lose of power?

If the RPM’s increase without an incease in vehicle speed then I would suspect the clutch is slipping. When the replacement clutch was installed was the flyweel resurfaced/replaced?

Tester