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#1
Wed, March 11th, 2009, 10:42 AM
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I suppose you COULD have a dirty throttle body, but since you have a 2006, this seems a bit soon for that. The only way to tell is to look.
I've never seen the "dip" you describe. And, my idle RPM is in the neighborhood of 600-650. Could the "stumble" have been the AC coming on? - Jack 
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#2
Wed, March 11th, 2009, 10:46 AM
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No i make sure my Heat is only on floor and not in the "Auto" position so the A/C wouldnt be triggered to come on.
I definitely have a big dip in the throttle when i let off...so something is wrong there. The weird surge i recently discovered today is very bizarre. Yeah with it being a 2006 and only 22k miles on it- i didnt expect to have these problems already.
__________________
2006 F-150 FX4 Dark Shadow Grey 
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#3
Wed, March 11th, 2009, 10:52 AM
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mine is abou the same but 06 with 50k. I didn't know if my exhaust has something to do with it. Its not true duals but two rear cats removed, and a dual in dual out magna flow, no x pipe or anything.
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#4
Wed, March 11th, 2009, 12:10 PM
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I agree with Grabber523 check your vaccum hoses especially the one for the brake booster. Remember there was a recall on that one.
Is this happening while in d at a light or just sitting there in p. Maybe add a little to the idle using the gryphon and see what happens if ones availible. Lars
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SENIOR MODERATOR--PTLA God doesn't have a Facebook but he's my friend. God doesn't have a twitter, but I follow him.
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#5
Wed, March 11th, 2009, 12:45 PM
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Yeah i knew about the recall...the dealer fixed that item for me.
Ill try the vacuum test and see what happens. It was sitting at a light in "D" and it happened. I dont remember what my idle is at right now but i will check tonight.
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2006 F-150 FX4 Dark Shadow Grey
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#6
Wed, March 11th, 2009, 01:18 PM
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I'm leaning towards vacuum leak. I also wonder if this is related to the throttle body issues.
I'll have to check TSBs and see what's up. Be back shortly with information.
__________________
Bill Cohron - The Mad Doctor   Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997! (678) 890-1110 www.gopowerhungry.com - Home of the Hydra Chip, Minotaur Tuning Software, and the new Orion Reflash System for Navistar! Bring back  Windows™ XP and 7.  Windows™ Vista and Windows™ 8 is a pain in my a$$!  Windows™ 10 is only slightly less annoying!  Windows™ 11 is garbage!  Much to my surprise, I'm actually quite enjoying Linux! 
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#7
Wed, March 11th, 2009, 10:00 PM
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My idle is at 500rpm if im reading it correctly...
you have the notch at 0 and then there is 3 notches between 0 and 1 and sameway between 1 and 2 and so forth. So each notch should be 250 increments. well my needle is right on notch number 2. which would tell me its 500 correct or no? Where does all your idle needle stay at?
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2006 F-150 FX4 Dark Shadow Grey
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#8
Wed, April 15th, 2009, 11:41 AM
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I am having this same problem in my 07 f150 with 15,000 miles on it. The engine is surging bad when I am ideling at the light. I took it to the dealership and they said that they didnt experience the surging when they had the truck but blamed it on my cold air intake. I would really like to find out what this problem is so if anybody figures this obne out please let me know.
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