can a bad ASD relay cause hesitation and stalling? Can it cause codes 12 and 43? please help

 

Why would you think the asd relay would cause this? Code 12 means nothing. Code 43 means misfire. Check your coil, spark plug wires, plugs, fuel pressure, compression, and injectors.

 

i had read on another site that the ASD relay controls quite a few things...the problem is during this same issue my car is also hesitating and even stalling(along with dieseling). I have changed the O2 sensor about 2 weeks ago. The coil pack,plugs and wires are all less than a year old.