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HELP! 08 f150 bogs down

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Old 02-28-2011, 07:37 PM
Senior Member
Join Date: Aug 2005
Location: LOUISIANA,
Vehicle: 2008 FORD f-150
Posts: 139
HELP! 08 f150 bogs down

Hello, I have a 08 f150 with 100000miles and just recently it started to bog down under load, I have changed plugs (with oem) o2 sensors (oem)fuel filter, cops, maf,

I have ran 4 tanks of gas threw it now from place i know the fuel is good, an still acts weird. I can be goin down the road and it seems like i hit a head wind when i pull trailor an when i start giving more throttle it does nothing till i hit down shift trigger.

Any ideas would be appreciated.
2011 F-150 XLT ecoboost Bak-flip F1
with 08 fx2 20" wheels
5STAR Custom tune
MagnaFlow cat-back
Afe Stage 2 intake
Afe Power tube
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Old 02-28-2011, 09:17 PM
Technical Article Contributor
Join Date: Oct 2006
Location: Michigan
Vehicle: 1997 Ford F150 4.6
Posts: 1,754
I take it you have no code. Could be the throttlebody sticking. My son had the same problem on his 2006 5.4. It finally threw a code and it was indeed the throttle body hanging up and not reacting to the pedal action. It has been an issue on some 5.4's especially in cold climates which I don't believe you reside in but it may not be a true factor.

Last edited by DYNOTECH; 02-28-2011 at 09:21 PM.
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Old 03-03-2011, 11:29 PM
Senior Member
Join Date: Aug 2005
Location: LOUISIANA,
Vehicle: 2008 FORD f-150
Posts: 139
Thanks for reply, but i tested it today and was okay. So i put my stock tune and airbox back on and now the truck runs fine.

Why would all the sudden truck start acting like its running out of fuel, but with stock tune run fine?

Im at a lost
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