1990 RR, vehicle runs great most of the time. Some times i come to a stop at a light and the RPMs drop very low. If i try to give it gas and move from the stop it wants to chug and spit back through the intake. (what it sounds like anyways) If i stop the car, shut off the ignition and restart the vehicle then it will Idle and drive fine until the next stop light. I took out the Air Bypass it was pretty dirty and cleaned it. Timing is good, new plugs, cap and rotor appear fine. Would love some ideas. I am new to the RR world just bought this a month ago and i am looking forward to fixing it up. Thanks.