Every once in a while the car will be sitting for about 3 hours then when I make an attempt to start it it takes about 4 seconds to crank. Then suddenly for a while I don't have this issue. No check engine lights as of yet. One day I did put it into reverse and had a hard rough idle. and then at one point in time had a rough idle at stop lights. Now all of sudden all of these symptoms are gone. They come and go come and go. No more hard start rough idle! What could it be?

 

You have to change both of them, I was dealing with the same problem I change one of them since that's what the computer code said, but my mechanic suggested changing both. Of course I didn't listen next day I had the same problem I change the other one now it works perfectly. High recommendation to change ASAP my car turn off while in the parkway lucky I was near the curb side

 

And for these make sure u get the OEMs