If the Throttle body or tps sensor is an issue ,it would have showed it in the pending codes, as long as you did not disconnect battery since the failure and erased the codes :)
The gas pedal not feeling right ,i m not sure i cant feel what it is doing , i m assuming since it is not getting enough gas it is doing that ?
there can be fuel at the rail but just not enough ,because of a weak fuel pump, pump lost its pressuer , especially when you sprayed it ,it started quicker, the fuel pump assembly is common failure on these tahoe
Change the fuel pump assembly in the tank
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