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  #1  
Old Wed, July 6th, 2011, 10:36 PM
RGSMDNR RGSMDNR is offline
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Default Truck stumbling... stuttering...

Drove my son to the his day home the other morning and the truck starting to sputter a bit. When i was parked I changed it to the stock mode and everything seemed ok. I was running the econo tune at the time... any idea on why it would do this all of a sudden?

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Old Thu, July 7th, 2011, 08:09 AM
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IDK.....

When I had my 06 F150 this happened to it three times......once before I got a gryphon, once while a canned tune was loaded, and once when a custom tune was loaded.....

Alls I ever did was shut the truck off and then restart....it acted like nothing ever happened......

I don't think going back to stock was necessary.......
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Old Tue, August 16th, 2011, 04:21 PM
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Ive managed to get the truck to do it again. I was in the towing tune and while backing up the trailer I would blip the throttle a bit and it would then start to stutter. It did this each time I blipped the throttle. Any thoughts on why it would do this?
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Old Tue, August 16th, 2011, 04:36 PM
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It might be time to clean the mass air flow sensor and the throttle body....
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Old Tue, August 16th, 2011, 04:37 PM
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Check to see if the intake and everything is tightened. It happened to me yesterday while playing around in a dried up pond. The intake (after the MAF sensor) started to wiggle loose and open up. Then by hitting the throttle the engine would rock a little and open up a small gap. The MAF sensor would read less air and cut fueling and the rpms would drop. I've had minor cases happen at red lights and stuff when I would gun it to start moving but it was never enough for me to figure out what was wrong...until I was exiting a drift through some very fluffy silt and it finally opened up a crack and got me stuck.
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Old Mon, August 22nd, 2011, 10:04 PM
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Thanks all, Ill look into that.
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Old Tue, May 8th, 2012, 07:01 AM
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Diggin up an old thread, but its doing it again. It only does it when Im using a custom tune. This time I was using the econo tune. It also seems to be getting worse. It would go away after driving it but now its staying while driving down the road. Had to pull over and reprogram back to stock. Why would it only do it while in a tune? Everything seems tightened and clean.
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Old Tue, May 8th, 2012, 08:01 AM
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My next guess would be fuel system.
Where are you filling gas? What brand are you using?
Fuel quality has been known to cause issues also. I'd try mixing in some premium and see if that improves it.
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Old Tue, May 8th, 2012, 08:27 AM
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I fill up at Costco so not sure where they source their fuel from. Im also running a 89 Octane tune but 87 fuel and am turning the timing back 1 degree as per required.
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Old Tue, May 8th, 2012, 08:57 AM
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Quote:
Originally Posted by RGSMDNR View Post
I fill up at Costco so not sure where they source their fuel from. Im also running a 89 Octane tune but 87 fuel and am turning the timing back 1 degree as per required.
Ok, go to Shell or another top teir brand. Not all fuel blends are equal. 9 times out of 10 it pays to spend more per gallon more for higher quality fuel.

For me it means up to 1 mpg difference...or nearly 10% increase in mileage for spending 1% more in price.
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