2004 Ford Explorer bucking when decelerating

2004 FORD EXPLORER
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BO1839
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Engine Performance problem
2004 Ford Explorer V8 Four Wheel Drive Manual 62xxx miles

while the engine is warm and i am driving up an inclne between 40-50- mph if i decelerate or let my foot off of the gas the vehicle begins to buck about 8-10 times in a two-three second phase then stops it feels like something is going to fall off the vehicle
Mar 15, 2010 at 10:07 PM
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JACOBANDNICKOLAS
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Has the check engine light come on?
Mar 15, 2010 at 10:09 PM
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BO1839
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No check engine lights... it is at the dealer and they say they cannot find anything nor has the diagnostic shown any codes.

recently (2mos) ago the head was warped it was taken off and milled down. When i received the car back it was doing this bucking i took it back and they told me they replaced all 8 sparkplugs. 2 months later it's bucking again
Mar 15, 2010 at 10:16 PM
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JACOBANDNICKOLAS
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The only thing I can say is check for vacuum leaks, a sticking TPS...
Mar 16, 2010 at 6:27 AM
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BO1839
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whats a sticking TPS?
Mar 18, 2010 at 9:11 AM