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It's probably not your TPS. Unlike most cars these days, the 944's TPS is a Throttle Position SWITCH, not a variable resistor sensor. The 944's TPS only senses when the throttle plate is at idle, and full throttle. Nothing in between.
Some amount of stumbling and lurching when these cars are cold is not terribly uncommon. If the problem is severe, check the air flow sensor, the air temperature sensor (integral with the flowmeter) and the coolant temp sensor.
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Mike
'92 968
'01 VW Jetta TDi
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