Update...that only took 5 minutes that wasnt so bad

Ok heres the results...When it first started the farthest I could get the RPM's was 4000 30 seconds later 3000 then 2000 this is floored!
If I let up on the pedal there is a slight rise but only slight....Could this be a fuel prob?..also how can I test the fuel filters? can the original fuel filters be replaced with say the ones from pep boys?..this is how chevys work..Im sorry Im just new to the porsche thing...I still have to check compression