Hi there, thanks for writing about your 1979 Volvo 244. First, you should confirm there is good spark at the spark plugs to eliminate ignition as a problem. Then, check fuel pressure for the correct pressure - it is likely...
All of these problems are most likely linked together by a faulty wheel speed sensor (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-wheel-speed-sensor). If the ABS light is on, a fault will be stored pointing to the faulty wheel speed sensor. You may want to enlist the...