It could be a dirty air filter or a dirty throttle body.
crankshaft sensor going.
I noticed rough idle on a 2001 MGM and what seemed like transmission slip while going uphill. I replaced the spark plugs. Both problems went away.
the 96 fordwindstar sucks
you pooped in your pants!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
replace timing chain
When the going get rough, the rough get going.
you might have a leaking vaccum hose
Motor mounts are bad
Carb.? Float sticking? Rebuild or replace
Run a compression test to verify the condition of the engine.
The cabin air filter can not cause a rough idle. It only filters the air for the ac/heater.
check make sure the firing order is correct.