So i bought a 1984 d50 2.0. it ran when i bought it. The truck starts up when cold perfectly. After i go about 15-20km it starts shuddering and slowing down until it dies. Then when its cold in a couple hours it starts right up. the temps remain the same. It did this a couple times. now it starts for 3 seconds or so then dies. I clean out all the fuel lines and tank. I don't know where to start looking. Possibly the timing chain or jets in the carb? let me know what you guys think. Thanks