Codes for 2002 Chevy Silverado?

Samantha

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My husband's truck broke down recently. He replaced the Fuel Pump the spark plugs and wires. He's a heavy equipment mechanic and He's having a bit of issues. I have the codes, but it seems once we fix something more codes show up.

The truck has 170,000 miles on it and is idling really high. It is also having difficulty shifting from 3rd to forth gear while it's going up hill. Going Down hill it's great. He replaced the Map Sensor and the TPS (Throttle Position Sensor) Here are the codes the computer is giving us.

P0122
P0453
P0106
P0121
P0123

Here is a list of all the work we have done to the truck since it broke down last week.

Fuel Pump Replaced
Spark plugs Replaced
Wires Replaced
Engine Oil checked ,changed and filled
Transmission oil checked and filled
Map Sensor Replaced
TPS Replaced

If we could have some insight and maybe some suggestions. Our coed book says that all our codes is what we have already fixed and yet it still acts funny.
 
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