2001 rough start idle

[rabidfarmhand]

I have a 2001 suburban with 211k on it. It's been rough starting as of late. On a cold start up it idles extremely rough, with a kind of a wavering, choppy idle. It'll shoot some codes every now and then, it's sort of random when they show. The codes are 0171,0174 which is left and right banks too lean, 0300 which is engine misfire, and 0341 and 0343 which are camshaft position sensor range problem and output high signals. After warm up it seems to run o.k. although it does seem to waver or undulate during some accelerations. It also has become a problem of starting when it's warm, taking several attempts to start. I'm going to replace the camshaft sensor due to the fact I changed it several years back and it's still under warranty. It has new fuel pump, spark plugs and wires, and new fuel pressure regulator. This problem is driving me nuts. Any suggestions? Wonder if it could be a the sensor only? It seems more of a fuel problem, but I'm just grasping at straws. Thanks for a any help.

 

[zora]

have you checked for a vacuum leak, hoses, throttle body, etc.

 

[Suburbanized]

Have you thought of checking the fuel injectors? Spark plugs and wires?