The engine seemed fine for a month or so with little trouble but yesterday when I went to go to work I pulled out into the road and when I pushed the pedal down then engine would not go. IT would idle fine but as soon as I gave it gas it lugged if you you get what I mean. Not rough or anything, just would not power up or accelerate. Oulled back into the garage and took the jeep to work. After work I got in and it started up and drove fine till I got to about 20 or so and then same thing - would not accelerate. Any ideas?