If you are dealing with a car that "sucks" in the literal, mechanical sense, here is a write-up on why your transmission vacuum modulator might be the culprit. ⚙️ The Mechanics of "The Suck"
Inside the modulator is a flexible rubber diaphragm. Over time, heat and age cause this rubber to crack or rupture. When this happens: tranny suck hardcore
As the engine burns the ingested transmission fluid, a thick, acrid cloud of white/grey smoke pours out of the exhaust. If you are dealing with a car that