Engine drivability problems can be caused by a failing mass air flow sensor.
Car Problem Reports
Volvo 240 Driveability Issues Due to Failed Mass Air Flow Sensor
Volvo 240 Problem
Engine Affected: 2.3L 4 Cylinder
Average Mileage: 136,666 mi (105,000 mi - 160,000 mi)
Visitor, 1990 Volvo 240, 2.3L 4 Cylinder, 105,000 mi
car backfires, wont start. replaced air mass sensor. works fine now
Visitor, 1991 Volvo 240, 2.3L 4 Cylinder, 145,000 mi
poor performance/gas milage. Installed rebuilt mass airflow sensor. It failed very soon after.Bought new. Very easy to install.