I have been having a stutter problem for a couple weeks now, it pulls the code p0500 which is the speed sensor, but I have already replaced this with a new one. My idle will hang sometimes and the car will stutter under low rpms going down the road. I have noticed that I can get the check engine light to trigger by reving the engine while sitting still and it will be that speed sensor code again. I have checked for vacume leaks replaced plugs, not sure what it could be, but I did pull the vacume to my egr and notice there is no vacume from that line. When is there supposed to be vacume on that line, I can rev the car and still can't fell any vacume on the line, I traced the hose and it looks like its hooked up to a vacume source, anyone know what it could be, this is a 98 cobra, thanks