I have a 1999 Seville SLS that has been intermittently hard to start and when it is hard to start it will bring up a P1350 and P1375 code. I have changed both crank position sensors and the cam position sensor. I have also changed the fuel pump and filter. We love this car, but I am beginning to fear leaving my wife alone with it. It does always start eventually , but I know the day will come that she will be calling a tow truck.