can you ck any of these... and if they go bad do they always throw a code....

check O2 sensor, which is supposed to give a check engine light. (Haines has isntructions. But basically, put positive voltmeter probe on green/black, negative on a cleanground. Itshould read steadily between.1 to.2 volts runningcold. after a couple of minutes when the thermostat kicks in at temperature, you should start to read fluctuation between .1 and .9 volts. if this doesnt happen after 3-4 minutes, shes fried)
i copied this from another thread

TBI is probobaly fine, I dont hear of them braking. Pick-up coils can wear out. they probably wont throw a code, and theyre cheap to replace.

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'91 D150, standard cab, standard bed
'63 Rambler American 330