when the engine is brought above 2300 rpms it stumbles like it is missing and won't rev over 2500 rpm. this is while driving. '99 3500 6 spd 4x4.

ps i replaced the crank postion sencer a week ago, but still get codes no cel

 

What is your fuel pressure????????????????????????

 

don't know, no gauge. i quess ibetter get one.
why would someone putt a an inferior lift pump on an engine that should last for 500,000 miles with good maintance?

 

Yes its an inferior engine but you got to remember they wont make any money without you buying parts from them. I just replaced 1 injector and the IP. You must get a fuel pressure guage

 

ok, just after i bought the truck the CEL or MIL came on. had autozone check codes (PO336, PO234, PO236). bought a scaner and replaced crank sensor, cleared codes. problem solved, so i thought. i'm still getting the (PO234, PO236) codes. what is the posible cause of these codes and are they related to my first post?

 

If you dont want to spend $$$ on an in-cab gauge get a mechanical gauge from Harbor Freight or something. Gotta be fuel pressure causing it. Change the fuel filter and see if its still going on. Is the P0236 the VP44?? Can't remember.