P0121 is throttle position sensor #1 performance . Could be the sensor, power, or pcm. Leave the code and get car to dealer to diagnose ..... there are 3 pages of diags and you need DRBIII to perform most of them.
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2004 PT GT -Stage 1, K&N Drop-In, Airbox Mods, \'05 Composite Manifold, AMX TTAB, NGK V-Powers at .040, Magnecore KV-85\'s, Mopar BOV, BTG Strut Bar, Mopar Rear Sway, Drilled/Slotted rotors, Hawk HPS Brake Pads, a few visual Mods, a coupla Road Runners, and a Partridge in a Pear tree......
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