Tonight when i was leaving a friends house my car nearly died. I had cranked it up and was backing up when it began dropping into the 300-400rpm on the verge of dying. I hit the gas to save it and after it had warmed a little there were no problems. I had replaced my plugs two days earlier with the 7 instead of the 6. The time i drove it before it almost died i barely, if at all, got it up to normal operating temp. I have noticed over the past few weeks that it takes a while to crank up if it is cold. The starter just spins for a good 5 or 6 seconds before starting. Is it my battery of something else?