While driving the car stalls, lags and makes rumble sounds. It will stall and go down in revolutions from 3/4 down to 2 or even 1. It does this whether I am actively driving in the highway going 60 miles an hour or pulling of from a red light / stop sign. Is anyone else having this problem? Is very scary and nerve racking when in the highway going at 60 miles an hr and it just stalls and lags and takes a minutes to pick up speed