It sounds like a bad throttle position sensor. I would look to that first, although when they go, they usually just go bad and you don't get throttle at all.. If Ford is saying there is a known issue, I would probably start there, but if it's a recall they can't charge you for it. If it's just a TSB, you will likely have to pay to get it fixed. This isn't something you want to skimp on though, a few dollars is far cheaper than an accident, especially one where someone gets hurt.
I guess I would tell the Ford dealer to do the TSB, and tell them if it doesn't fix it they need to put a new TPS in for a discount for identifying the problem inaccurately.. 
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2006 GT Premium Vert, 5 spd, Tungsten Grey
Show: Painted gloss black stripes, Street Scene Gen 1 body kit, side and hood scoops, CDC light bar, sequential tails, purple underglow, 8" shorty antenna, redline hood struts, Steeda Ultralights, 20" Chrome Killers, S.O.S. pillar & 3 gauges.
Go: J&M LCA's & Adj. UCA, J&M Adj. Panhard, CHE LCA reloc brackets & torque limiters, 3.73 gears, Kenne Bell Stage 1 2.6l supercharger.
...440rwhp/401rwtq | 
mustang driving its self! 
