A couple things come to mind, however let me cover this before I forget.
PCV valve is locaked at the belt end of the motor. There is an odd looking (I think squarish) cap. It comes off..some have used pliers/channel locks to get it off.
Check the resistance between the two terminal on the tops of each coil for inconsistencies between coil packs.
Check for vacuum leaks..you mention hearing it gulping air. (common vacuum leak is under the air box, the connector from the metal lines to the charcoal canister.
Sticking with Echo SSEi'* logic check the resistance of the Taylor wires. Many here have had bad luck with them.
Autozone unfortunately can't read the OBD 1.5, Advance should be able to...remind them it'* an oddball OBD year. (On that former GM employee at Autozone
.. enough said)