sounds like a problem I had with my first gsr, it was a 94 as well, and every now and then it did that, I had my mechanics check it out and they said nothing was wrong but they reset my ecu, aka pulled the neg batt terminal for 30 or more seconds, and charged me $30 for the time to check it. it ran fine after that untill a stupid soccer mom tried to kill my wife while she was driving the car