My car (98 altima, 122k miles) misfired twice yesterday.

1st, I started the car in the parking lot. After about half a minute, I turn on A/C then it misfired.

2nd, I drove on local roads for almost half an hour. When waiting for a red light, I turn on A/C then it misfired.

Idle speed is around 1k when A/C is off and around 1.1k when A/C is on.

No code found.

No problem when driving so far if A/C is off.

Any suggestion? Should I start with IACV or A/C compressor?