I have A Goodman furnace which started given me a problem 6 years old, The inducer fan motor continually runs all the time, the new filter I put in causes a 4 blink code restricted air, when I take the filter out I get a 2 blink code the pressure switch is closed, if I pinch of the vacuum line to pressure switch, the code goes off and the furnace starts up and runs fine until it shuts off, then will not come back on unless I pinch off the vacuum line again.

What is wrong here