1992 Chevy Truck engine sputters/hesitates

Welcome to the forum. What was the actual code? Think it might be spark timing issue? The wires at distributor, purple/ white tracer-- rpm signal, black wire with red tracer-- ground, tan wire with black tracer-- bypass circuit, when the engine reaches a certain rpm, the computer puts 5 volts on the bypass circuit, that tells the ignition module to use the signal on the white wire. Above a certain rpm the computer controls the spark timing by using the white wire, that is an rpm signal.