Had my truck for the past 3 years 76,000 miles. I have spent a lot of time reading through these posts, some helpful some not. Decided to join tonight considering I had the time and a couple questions. Just recently had my timing chain replaced due to rattle on cold start, occasional sluggish acceleration and even an episode or 2 of limp mode. Bought from car max, had the limp mode happen, they replaced plugs and boots and was good for the past 2 years. Rattle happened within the last year, ford in my area worked with me on the price and paid $900 on replacement timing chain and tensioners. Phasers weren't touched... I suggested this and even stated I would pay for them to be replaced, they stated everything would be looked at and replaced according to TSB. I'm and emergency room charge nurse, I don't know jack when it comes to vehicles but I can research with the best of them. Just put in a monster RX can yesterday myself. I've noticed a more responsive acceleration and better idle. Anything else I should watch for, concerned about, upgrade/replace? Thanks