got the code p0191 a couple a days ago and it is for fuel pressure circuit range/performance. anyone no if it's serious and if not how can I clear check engine light? tried leaving batterries disconected for 35-40 minutes with no success, light still on???? last question, could any of my mods have caused this? will be taking to dealer if no fix at home, should i remove intake system prior to dealer looking at it?