rough idle

[46L281GT]

So I've had the truck for a few months and i'm loving it as a daily driver. The issue I'm running to is it has a slight rough idle (nothing too terrible) with A/C on or off, only when at temperature. I have replaced spark plugs (not COP). I also do not have any soft of CEL I also checked for codes and no luck there either.

The other issue that I'm having is that when I try to start it after driving it that day it takes a while to actually start. probably 5-7 seconds of cranking. When it finally does start, it idles at around 200 trying to die for about 2 seconds then it's fine. I have replaced the fuel filter and no change. WOT is fine, cruising is fine. Any ideas for either of these issues?

 

[Funugy]

You may want to try replacing or cleaning the MAF Sensor. If this thing gets dirty it can throw off the fuel/air mixture. Easy to do.

 

[46L281GT]

Forgot to mention that i had done that as well

 

[Bedrck47]

which engine and what year

 

[Bedrck47]

How many miles on the expy??
Check for vacuum leaks by spraying with carb cleaner, pay attention to the rear of the throttle body and also the hoses that connect to the DPFE sensor

See the attached link

http://www.expeditionforum.com/f42/about-egr-pcv-dpff-evap-iat-tps-maf-23583/#post191356

 

[46L281GT]

2004 5.4 so it's the 2v. I will check for vacuum leaks and report back

 

[1997SCEBFEX]

are you hearing the fuel pump energize in addition to all the other work you've done?
any chance you have crud (ethanol-related) built up in the tank?

 

[46L281GT]

Yes I can hear it priming when key is on. I don't think it has any debris but I've only owned it 4 months. It has 119000 miles