Palerider

Your gut instinct sounds correct, mine did the same things yours is doing right before the rebuild. Blueish spewing smoke, no power past half, like it was loping under hard acceleration and shaking.... Ended up being broken springs, rollers in pump damaged. I waited to long and the damage inside messed up the pump body. H&H Diesel Injection Service (Milton WA) did my work and it really works great.