Glow plugs could have a problem not working but make sure you check the battery especially if you have 2 batteries one kind of weak battery can cause many problems.
SOURCE: MY 92 CUTLASS AFTER 20 MINUTES STARTS SHAKING
if a temp. light does not come on and the engine is not over heating I would look into the ignition components such as ignition module inside the distributor, sometimes when these components heat up they can cause this problem you described
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