Error code P0172: system too rich(bank 1)
In my opinion, replace the oxygen sensor.
Do you think that would cause the lack of power also? I had an ignition coil fixed today, had a P 0305 error code. Switched the ignition coil to 1 and got the code for cylinder 1 misfire. Replacing the ignition coil got rid of the misfire but not the lack of power. Driving home I then got the P0172 code.
does the engine run normal now? How many miles you have with the truck? Also try to disconnect your battery for about 15 seconds, it erases your faultcode memory and resets your PCM. It will iddle a bit funny in the beginning but it learns itself back. If not, replace the oxygen sensor. Do not forget to look up the code for your radio if there is one, you will need it!
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