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It was happened in the winter time, but back then I didn't pay attention to the outside temperature.
One thing though, when I told the Volvo master tech to check the TPS, he hooked up a Volvo handheld scanner to check the TPS while driving. He couldn't find any spike or abnormal during driving. But, he replaced the TPS anyway and test drive again with me. The bucking didn't happen with the new TPS. So, your tech may not find anything wrong with the TPS.
Hope this help.
Ching-Ho Cheng
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1995 855 NA, Bilstein Strut & Shocks, Volvo Protective Grill, K&N Filter, E-Code Lens, Alpine CD-Changer, AutoDim RearView Mirror, 6000K HID
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