I recently put new motorcraft plugs in my 2001 f150 5.4. when I replaced the fuel rail on the driver side I cut a seal and it leaked alot of gas for about a day causing my factory cats to fail. I fixed the seal and the fuel leak but had to put new high flow cats on my truck. The truck has true duels with 2.5 pipe and a 50 series dual in and dual out set up. I have afe cold air intake also which has been on the truck for years. I have what seems to be about 75% power as what the truck had stock. I also hear ticking when I first start the truck. The fuel economy has dropped a mile per gallon or so. I had the exhaust checked and there are no problems. The truck only has 99k and has always ran like a bat out of hell. Whats wrong?