97 jetta power loss

Hey I have a 97 Jetta gt. I have no idea what is wrong with it but i am losing tons of power, and cant seem to figure out why. Checked and made sure spark plugs were gapped correctly and then replaced them to make sure nothing was bad. Any suggestions as to what could be wrong would help lots, thanks...

are you using the Bosch silver sparkplugs? they are only available at the dealer. maybe an alternator? did you get a timing belt job done recentlly? they may have the timing wrong. hows your throttle body? there are many things that can cause power loss, can you be a bit more specific?