Here lately I've noticed my truck being pretty sluggish. When I floor it it take like 15 seconds to get to about 70. It's a 2008 Ford F-150 FX4 with a 5.4 triton v8. I've seen people online with a stock getting like 4 or 5 seconds 0-60 but I'm not getting anywhere near that. I've replaced the fuel filter so it's not that, the air filter is clean and basically brand new. The mechanic I brought it to about 3 months ago said he cleaned the fuel injectors so I don't think it's that. I can't think of anything else it could be but I'm worried there's something wrong with it