When we have it floored it will stay around 2-2.5k rpm's unless you downshift to second. I dont think it has the power to pull higher rpms. It makes a metallic clank. clank. clank. that follow engine speed, im not sure if thats harmless or if its part of the problem. I dont think there are any problems with the transmission or drag on the breaks. This problem was gradual it happened in a time period of about 1 month. We changed the fuel filter located near the diff. a few days ago but it didnt seem to help. are there any other fuel filters we are missing?
We think it may be either the lifters, the rocker arms or possibly a plugged ehaust? Thanks for your reply!