Q: Ok truck warms up driving down hwy sputters and jerks on 1992 Chevrolet 1500 Pickup

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Besides speed sensor what else would cause this
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Do you have any engine codes? If so please post. Fouled and failing catalytic converter, low fuel pressure due to fuel pump or fuel filter issues. Broken or dirty MAF sensor. Old spark plugs and wires causing incomplete combustion and a rich almost flooding condition. Failing ignition control module. The list goes on. If you don't have any codes (yet) have catalytic inspected and clean your MAF sensor and see if that helps. If it doesn't you may need to take to a shop for a diagnosis.
The plugs wires icm dis cap tps egr. my next step is the fuel pump strainer and coil. runs great in idle sometimes killsbut in gear rpms drop like it has a load no codes also cut converter off