Rev limit at 5k??????

[dubbs693]

I searched for a bit and couldn't find this exact problem..

My car is auto -> Manual swap. With s13 exhause cams on a 95 s14 rebuilt engine.

This has only happend to me twice since I have owned the car for 2 months. It hits 5k and bounces off it like a rev limit. It seems to be only when it is really damp/wet outside. This happend to me on saturday, then on sunday it was fine.. It actually reved a lil past 7k rpms.

So, I don't understand why this happens randomly.

It has Cold Air Intake/Header/Exhaust and new o2 sensor. So, Any ideas?