I have a 1997 gmc Jimmy had it just about a year and just recently iv been having problems first the fuel pump and instrument cluster quit working I figured that out it was a ignition switch then the next day I drove about 40 miles with no problem then all of a sudden it was missing very bad the engine lost power so I pulled over and had my code reader with me no misfire codes the only codes I got were p0340 and p0341 both camshaft position sensor so I changed that nothing then I put in a new distributer and drove about 30 miles seemed good but the next morning nothing once again and those two codes are still there fuel pressure is at 53 lbs so if anyone has any advice it would be appreciated