Chevrolet Repair: engine misfire no.3, fuel pressure gauge, intake plenum

Question
Hi James, S10 chevey,4x4, 4.3ltr Throttel body injection. running rough.. I try 3 sets of new plugs oem, new wires, cap rotor.. where should i look next? thankyou 4 your time.  Adam

Answer
If the misfire is number three and you have put new plugs in, I hope that you didn't by mistake crack the plugs.  That is the worst one to change on that motor.  But lets hope that you didn't crack it.  These engine a notorious for bad fuel injectors.  You will need a scan tool and fuel pressure gauge to test this.  This is located under the intake plenum.  if this is okay, check all the computer wiring that goes to the fuel injector connector.  Sometimes the connector gets pinched under the intake hose assembly.
Jimmy