2009 Mitsubishi Lancer engine problems

As I was driving up the I5 going up the grapevine in ca at 65-70MPH my vehicle made a beeping noise and dash showed thermometer that said slow down. I slowed down to 60MPH and went into the left lane or (slow lane where semi trucks drive). All of a sudden the car started to slow down more and more until a semi truck got extremely close and had to veer into a faster lane because my car was only going 40MPH. I found an exit and exited the freeway.

Tl* the contact owns a 2009 mitsubishi lancer. The contact stated that while operating the vehicle, the blower failed and the front wind shield could not be defrosted. The contact also indicated that while idling, the engine rpms would fluctuate and the engine would appear to be stalling. In addition, the vehicle would not accelerate properly from a standing start. The cause of the failures were not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was 50,000.