Hello everyone, I have a 2000 STS 66K, I live in the midwest, a few times lately, twice today the engine just shut off while driving down the highway at 55 mph, I pulled over - put it back in park and it started right up and I drove away, I had approx 1/4 of a tank of gas, I added 10 bucks worth and 6 miles later again at 55 mph it just died, same result started right away and no issues for 40 miles, I had the gas cap replaced a couple of weeks ago under the advice that it was a first - inexpensive (is it true caddy owners can't use the word cheap):cookoo: , also once and a while in the morning when I first turn the key I get nothing, no lights no ignition, just nothing, then I try again and it acts like there is nothing wrong and it starts fine, I bought a new key thinking this was a chip / security problem, besides I did not have a back-up, this also did not fix the problem, anyone have an answer for this problem ?