knock sensor------does the bad ks these cars are known for have anything to do with a bad surging and miss yhat i have???? or take it to shop to pull codes and put un scope?????? i was thinking fuel system prob????? have done tune-up. thanx.

 

What else are the symptoms? Some mechanic told me I had a bad knock sensor, the a couple nissan mechs said it was bad coils. After 1k I found out it was only a bad catalyc converter only $180