my friend has eg with an ls motor in it.the ls motor was recently rebuilt .its a 94 obd1 ls motor. it has spark in the 1st , 2nd and 3rd cylinders but not the 4th. but it is weak spark. we changed the cap and rotor in the distributor but nothing. he bought a new distributor but still nothing. we also checked all the fuses and relays but squat ****.we even checked all the ground cables and redid the timing about six times and nothing.and the last things we did was replace the spark plugs and wires and the ecu and still nothing. please if anyone knows what the problem might be let my know any responses will be very appreciated. thanks

 

mine did that to and it was the fuel pump main relay.try that man

 

any chance you replaced the #4 spark plug wire itself?