How do you get the air filter out for replacement in a 1994 Chevy G20 van The top easily unscrews and removes but there does not seem to be an opening big enough to fit the air filter through?

wiggle? you may have to unscrew something but ..read up.. Everyone should have a manual for their vehicle, and the local library should have a professional shop manual available to make copies of for FREE...make the time to take time to read up on your vehicle, and work like the PRO'S! Good luck :) Dave