[Tha_Infamous_E]

I installed an HUD that connects to the OBD2 port - it works fine mostly for regular driving, but I've noticed that when actually taking corners and driving aggressively, suddenly the car's transmission gives out, falls out of manual gear disallowing from proper gear changing, and check engine light comes up for several days. All of the issues sort themselves out after I remove the HUD from the car and drive around for couple days, but the gauge is very useful when driving performance-wise. Anyone know why this OBD2 port messes with the cars performance ability and how I can have it fixed so the gauge works without messing with the car?