It popped and then sounded like gravl was tinkling under hood for jsut a second and thensounded like a header broke loose. When I pulled over an opened the hood I knew it wasnt a header it was high on the engine way in the back. I then thought maybe a ERG valve. It had very little power but I could turn it off and then start it again. I had it put on a roll back and taken to the garage. They said it blowed the plug out and there was damage to the hole. It broke the coil on that cynlinder. I also talked to the auto repair teacher at the vocational school and he said.. something about if you change the plugs on a warm engine this has been know to happen after 130k and especially a 5.4. He has seen it 4 times. Everyone is suggesting I just replace the engine and forget about trying to rebulid this engine. I had no warning at all this vehicle ran great never a noise or a miss in the engine. I was cruising at 40, no load, no pull on a hill nothing. They also said it usually happens on the passenger side of the engine & if I fix just that one cynlinder the next one in line would go sooner or later. I perplexed and dont really know what to do. I am trying to get all opinions and info I can before I dump 5500.00.
