I just replaced the distributor rotor and it spun quire free.I once had the same problem. You need to be more specific about the problem. For me, my truck would randomly shut off while driving and it turned out to be the distributor bearing. which would not let the rotor rotate. If you can take your distributor off and rotate it by hand and it doesn't move freely then it could be the bearing inside. Also make sure the distributor is clean, these trucks are picky about distributors.