My ck1500 has a 5.0 and has been cutting out, kind of bucking on acceleration. After a few weeks of this it started to run real bad almost stalling at stops and gave a po300 / p0308 code. I changed the plugs, wires, cap and rotor, the code continued so I changed the fuel spider. The lower intake was also replaced for water starting to seep. This didnt fix it so I changed the coil and ignition modual. I misunderstood how to check fuel pressure and wound up replacing the fuel pump. Now Im back to the truck running but still bucking and power comes and goes, sometime it kind of kicks back just a little on the starter. The timming is within 2 degres. I looked at the lifters they are lifting good so I ruled out the cam. The ecm no longer gives codes. A parts guy told me the ecm may have problems sence Im not getting codes. Tomorrow Im going to get a compression check. It runs strong for a short while then it acts like its missfiring. I cant find any vaccum leaks and Im way out of Ideas.
Sunday, February 10th, 2013 AT 4:42 AM