I have an 88 S10 2.8 fuel injected 5 speed manual transmission. Truck will start, but will not stay running unless you feather the gas to try to keep it running. Once it backfires through the carb, it throws a code 24, which is a speed sensor. I cannot find this speed sensor. They say it is on the tail end of the transmission. There is no electric going to the back of the transmission. Replaced fuel pump, fuel filter, cleaned throttle body injectors, checked all wiring, grounds...still having problem. Is this possibly a computer problem?

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Yea I'd go and try taking it somewhere where they check up on computer stuff. Also check your spark plugs, sometimes its the little stuff that screws stuff up.