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You need to make sure the timing that the light is showing is correct, it can be wrong depending on the pickup and timing light used and where you are measuring from.
When you unplug the tps the ECU should turn off the timing compensation which will stop the bouncing of the timing. Compare the timing on the crank with and without the tps connected it should bounce like crazy with tps and be steady without the tps. That is how you know the ecu is ready to be timed when the tps is unplugged and the timing is steady. From there you need to make sure the rpm is low enough to be in the base portion of the timing map for idle speed timing. The cas will be nearly center but always slight off center thats how you know the timing chain, cas, and timing light is all lined up.
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