Engine is sluggish on startup and tires chirp

If you mean the "engine cranks over slowly sometimes", it may be a weak battery. You have a 2005 and the battery is now 5 years old if it hasn't already been replaced. As far as the tire issue, I would check tire pressure first, quality of tires and how much tread is left. Depending on the mileage, it may also have a shock problem. Really need more info for this diagnostic...

I have all of these same symptoms.uch stronger shocks and chaned the tires with no significant change. The dealer tells me its normal nothing to worrie about. Some times its down right scary. My motor also started running sluggish at about 29000 mi. again the dealer says no problems with the sysyem. Not to plesed with this one of many f-150 I have owned.