I have a 1991 LJ70 with the 2L-T Diesel in it. I purchased it as non-running condition as it had been sitting for a good while. I dropped the fuel tank, cleaned it and put fresh diesel with some injector cleaner in it. I've also changed the fuel filter and air filter as they both were overdue to be changed. When I first start it when cold it runs and drives fine until it gets warm and I try to drive it. It will bog down and lose power then eventually die and puff out blue-ish smoke from the exhaust. Any idea what the next steps I should take are? Any help or advice is greatly appreciated!