Fill it half-full with decent fuel (see toptiergas.com) and then have someone pull the code. It's an OBD-II compliant vehicle, so just about any parts store can pull it. There's probably an indy around that does free code scans as well.

If you do take it to a parts house, don't try and let them interpret it for you - just get the code and report back. It should be P0300 or something similar if it's engine related.

Also, any particular reason you've rendered the onboard diagnostic system useless in the vehicle that carries your daughter around?

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.