Oldsmobile/Buick Repair: 94 buick le sabre- 300 code?, buick le sabre, crank sensor

Question
3800 motor, has new crank sensor ,coil pack, emc checked, but code keeps saying 0300? multiple and erratic firings. what can we check or fix next?where do we go from here?car runs for half hr then boom yu dont what will happen?has new fuel pump too! I am at wits end!!!

Answer
hi rick.i saved your question for last because this is a tough one sounds like to me spark plug wires are misfireing.they need replaced.you said you had ecm checked.the bad thing about a bad computer is it is hard to believe it .sometimes the part that registers the codes also controls the spark.so if these wires don,t do the trick suspect a bad ecm good luck billymac