I have a 1995 ford bronco xl with 154000 miles. i recently bought it and having trouble off the bat. i have a knocking sound coming from the engine but it dont sound like a major knock. it sounds like a lifter but i am not for sure. the motor is a 5.0 efi. i have taken to several shops but get mixed answers. there is no smoke and it has good oil pressure also. where would u start and how much work is involved or what would u do.