[BNaylor]

Based on my experiences the FPR is very seldom the problem but there may be exceptions. However, proper troubleshooting is required. I had recommended running a fuel pressure test so you could make a determination. The fuel pressure check tests the FPR and as to whether it is functioning properly. Based on the reading with vacuum connected and disconnected at the FPR, if the reading on the gauge deviates by 7 psi or more than the FPR should be replaced. Based on your symptoms you could have a problem any place in the fuel circuits. It could be the fuel pump or the fuel pump relay. An ignition related problem can cause it. A bad MAF sensor gives similar symptoms.