For the past maybe six or seven months, when I would drive the car. I noticed the smell of gas but just thought it was because I had put gas in the car. When I had the smog done on the car the month before, the shop informed us that the car is leaking fuel in the engine. They showed my husband were the leak was (fuel pressure regulator) and he tried to fix it but the fuel pressure regulator is also connected to part of the throttle body. He didn't want to mess with that. We took the car back to the shop and they replaced the fuel pressure regulator and the throttle body gaskets. My car no longer smells like gas but when I picked the car up from the shop Friday morning at 8:30am the car was fine, by 6:00pm I was driving the car and the RPM's started to jump to almost 4 1/2 rpms and when I tried to step on the brakes, the car almost didn't want to stop, I pulled back into a parking lot and thru the car into PARK. Then the engine returned to normal and then drove home. I took the car out on Tuesday to run errands and just got on the freeway and the engine started to race and the rpms started to fluctuate between 6000 and 7000 rpms. I tried to slam on the brakes to avoid hitting a few cars . I went to the nearest exit, I pushed the brake as far as I could and pulled the emergency brake and had to drive to the shoulder while the car coasted to avoid hitting the cars in front of me. I turned the car off thinking it would cut the power to the engine. But when I turned the car back on the the engine was still racing and car felt like it was trying to lurch forward. I turned the car off and on a few times, finally I turned the car and stepped on the gas and the rpms dropped back to normal. I went to the shop and told what had happened, their tech drove the car around, I told the car wouldn't do it again. All the could find is that the throttle cable and cruise control cable were not tight and they installed a nylon cable to hold them in place. They told to drive the car but only locally because if it happened again I should try to bring it back.