Terraclean on an old car may not be a good idea specially if the mileage is high, what i did i got brake cleaner spray which comes with a long nozzle, engine running keep your hand on the accelerator linkage and rev it while you spray inside the throttle body maf sensor, if you dont rev it while spraying the engine will cut out and spray short bursts.....it worked for me, also check the spark plugs for any oil residue!!! Check the dizzy cap and clean the contacts with sandpaper lightly and also check the dizzy arm ...along the line it seems like an ignition problem and easily solved...
J