Re: 2000 5.4 replaced the lifters - started ticking again
I'd get Motorcraft or Autolite plugs, leave the original coils if they're working, Get a 190 thermostat. If the engine runs cooler than normal, the fuel injection will add more fuel and the mileage will drop. Not sure about the spacer or the headers. Using the K&N is alright if you keep it clean and get some MAF cleaner to clean the MAF often. The oil from the K&N coats the MAF and they don't run as good.