Hi,
This could be the result of several different issues. What I would suggest first to check for diagnostic trouble codes. This vehicle doesn't require a scan tool to retrieve codes. It has an OBD1 system.
Follow this link.
https://www.2carpros.com/articles/nissan-obd1-diagnostic-trouble-codes-and-retrieval-procedure-1984-to-1994
Let me know if you find any codes and what they are.
Next, let me know if there are any strange odors, noises, or anything you can think of that could help me diagnose the issue. Also, pay attention to any odd exhaust sounds.
Let me know what you find.
Take care,
Joe
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Monday, September 27th, 2021 AT 7:28 PM