I have a b18c1 turbo running on 10 pounds and here is the problem. When i just try to drive it around town it jolts around and acts like it needs more fuel.. but it ideals fine and when i get on it there is no problems at all. however when i just hold the gas pedal at a certain point the RPMs go up and will stay were i want them for about 6 seconds then they drop back down then jump up again. i never had this problem before with the car. so any one have an idea what it could be. Thanks