Hello everyone,

I just did a tune up on my 99 f150 4x4 5.4l. Here is what i did.

Fule filter
Air filter
Oil change
Spark Plugs

The old plugs looked to be original Motorcrafts and the gap was like around .60. The driver side was the worse, i couldn't do it without moving the fuel rail to get to the back two. After doing everything the truck is running good, but there is still a very slight hesitation when i take off from a stop. I just added some fuel injector cleaner to see if that helps. I am thinking about cleaning the MAF sensor and i also noticed the Throttle body intake looked a little dirty. Any thing else that i should look at?

I would also like to thank everyone on here, this site has alot of great info that has helped me alot. Especially the sqeaking front end problem i had with the lower Ball Joint

Thank you

 

yes try cleanig the MAF

 

Well i drove the truck to work the other day and on the freeway it started to stumble a little. I would be doing about 60mph and just barely give it some gas and it would start to hesitate and kind of shake a little until i put the gas pedal down further. It only seems to do it if i am just barely pushing down on the pedal. Now it did this a long time ago and i noticed that there was water on the back COP on the passenger side. Now i did have the AC on for a bit and i started it doing it but it has also done this when i wasn't running it. I wonder if it could be a COP issue?

Thank you

 

A notorious problem on the model ac water on cop. Did you replace that cop and boot.