Need some help don't know really what to search for, my car revs in idle fine for the most part, i think i have an exhaust leak but I dont think that is whats causing what my car is doing, when its in any gear when i get about 2000 or 2500 rpms it just starts bogging down like its drowning or dying, but it doesnt die out i have to let off the gas and if i want to go anywhere i have to press the clutch in to rev it a little and then let off, anything would help, i just changed all the relays, battery, alternator ( had a bad alternator and car has been sitting with the previous owner ) its an 87 t2