NHTSA Complaint #11484998 — 2008 ACURA TL

While driving car, speed decelerated despite pressing on gas/accelerator pedal. Total ability to control speed on high way ended, as car crawled to a speed of under 5mph, nearly resulting in being hit by vehicles behind me. Immediately called independent mechanic who advised me to cut off ignition and restart the car. Highly dangerous to even attempt on a highway during rush hour traffic, nearly resulting in a multiple car crash. Reproduced several times until mechanic was able to diagnose and correct an issue unknown to me. There was no warning light indicator at all, no messages on car navigation/information panel.