The fuel pump relay may fail resulting in a "no start" condition, the engine will crank over but will not start and run. Checking for proper fuel pressure would be the first step in diagnosing this concern.
Car problem reports
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Most reported 1991 Volvo 780 problems
Engine stalling/stumbling problems can be caused by a failing mass airflow sensor.
When braking, a loose feeling from the front end can be caused by worn strut rod bushings. Worn bushings will require replacement. After they are replaced the wheel alignment should be checked.
Transmission oil leakage from the rear output seal is common, caused by a worn output shaft bushing. Our technicians tell us both parts should be replaced to correct this concern.