My uncle has a 97 dakota ,3.9 5 speed.160,000 mi ,and having trouble with it dies suddenly ,he has taken to dealer ship acouple of time ,have replaced crank sensor ,cam sensor,pickup sensor,altenator ,plugs ,wires,cap rotor and even 2 injectors,also had fuel pressure check and it was ok,problem usually occures io to 20 min. driving,suddendly dies ,will not retart,if you let it sit io min. it will always restart ,but prolbem continues ,any ideas?