Why would a 1991 190e 2.6 engine bog down and almost die out?

A 1991 190E 2.6 engine may bog down and nearly die out due to several issues, including a clogged fuel filter, which restricts fuel flow, or a failing fuel pump that can't maintain proper pressure. Additionally, problems with the ignition system, such as worn spark plugs or a faulty ignition coil, could lead to misfires and reduced engine performance. Vacuum leaks in the intake system can also disrupt the air-fuel mixture, causing rough idling and stalling. Lastly, a dirty air filter or issues with the mass airflow sensor might affect the engine's ability to breathe properly, contributing to the problem.