Hello Metoxes,
usually this kind of problem on your type of car is caused by a faulty warm-up regulator (bad hole upon acceleration) or faulty suppressors (misfiring of individual cylinders). Don't rule out the ignition, because an insulation fault on the HV-string particulary shows upon high engine load. It's the high voltage demand that makes a suppressor/cable end collapse under acceleration.
Get out the ohm-meter and measure the suppressors. The resistance value is marked on them (1k or 5 k ohm)
All the best,
Dokta