Recently a Diehard battery was installed into the vehicle.
The car began to idle high. Also two weeks after new battery was installed the car would not start. The battery was replaced again. Another two weeks later after driving the car for approximately 30 minutes turned it off when I reached my destination. About 5 minutes later I attempted to start the car and it would not start.
However, about 35 minutes later it started.
I took it to be serviced but they could not determine what might be the problem since they were able to start it each time they attempted to. They also did a diagnostic test but it did not reveal any problems. By the way they also adjusted the idle.
You assistance and consideration will be appreciate.