84-86 Booster Filter is in Engine Bay on Front wall next to Wire Hardness passthru.
Pull out filter and see if air moves easy. If plugged then bypass w/ metal tube.
Before connected this way....
Disconnect booster check valve, and use compress air to clear the pipe going thru the cabin. A lot of crap can sit there for years, get loose and suck by the engine.
I'm not sure if OE filter can be cleaned. I don't have one to take apart to see how it's made or could clean w/o doing more damage.
⚠️ Why Bypass?
After market filters are Plastic cases and have problems next to the exhaust.
87+ doesn't have the filter.
Booster pipe is also Bigger then others and uses booster check valve to fit bigger hose.
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
The Ogre's Fiero Cave