1987 Nissan Truck

Sometimes won’t start and/or shift 5 speed transmission. Is it a clutch problem?

We’ll need a whole lot more information to give any ideas. What are the exact symptoms? Does it rotate without starting up, or does it not rotate at all? When is “sometimes”? When it’s cold/hot outside, when the engine is cold/hot?

Please give more details as to exactly what’s happening, and when.

Will the engine turn over??

What do you mean it won’t shift??? Can you shift when the engine is off??

What engine??? 4-cylinder…6-cylinder???