Could a faulty TPS cause my truck not to kickdown?

It seems like the problem lies with the engine management system, rather than the brakes. Given that you've already replaced the MAF, MAP, and TPS sensors, here are some other things to check:

1. Vacuum leaks: Inspect all vacuum lines for cracks or damage that may be causing a leak. A vacuum leak can cause erratic idling, poor acceleration, and stalling.

2. Idle air control (IAC) valve: The IAC valve controls the engine's idle speed. A malfunctioning IAC valve can cause the engine to stall during idling. Try cleaning the IAC valve with carburetor cleaner and see if the issue is resolved.

If a 2010 Dodge Journey is able to start but won't idle, there could be several potential causes, including:

1. Dirty or clogged fuel injectors: Over time, fuel injectors can become clogged or dirty, which can affect their ability to deliver the correct amount of fuel to the engine. This can result in an engine that starts but won't idle properly.
2. Malfunctioning idle air control valve: The idle air control valve (IAC) is responsible for regulating the amount of air that enters the engine while the vehicle is idling. If the IAC is malfunctioning, the engine may not receive enough air to maintain a steady idle.
3. Vacuum leak: A vacuum leak occurs when air enters the engine through a crack or hole in the intake system, which can result in an unstable idle or engine stalling.
4. Malfunctioning throttle position sensor: The throttle position sensor (TPS) is responsible for communicating the position of the throttle to the vehicle's computer, which then adjusts the amount of fuel and air delivered to the engine. If the TPS is malfunctioning, it can affect the engine's ability to idle properly.
5. Faulty spark plugs or ignition system: If the spark plugs or ignition system are faulty, it can cause the engine to start but not idle properly.

If your Dodge Journey is experiencing this issue, it's recommended to have a professional mechanic perform a diagnostic test to determine the exact cause of the problem.

most bad cat converters do not affect idle as there is little gas flow problem at that speed
different at speed or full throttle
try using a scan tool to reset the ECM after all of the new parts
the sensors (O2 ) are not the faulty units as listed by the code p 2198 which are the heated oxygen sensors in the exhaust manifolds before the cat converters -- fault stuck rich
AS these senors (HO2S) report the gas composition to the ECM to adjust air /fuel ratio it is very possible that these being faulty , the ecm is allowing extra fuel into the engine and in effect running on choke
Using the throttle to idle suggests that the problem is air /fuel mixture for and idling engine and I would be investigating that area as the problem

I think you should check the throttle butterfly is closing fully and if ok suspect the idle air control is stuck wide open...

a bad tps, map sensor, or such- could just be the cold idle sensor

It sounds like the TPS was installed improperly..It has to be set in place with no tension on the spring loaded mechanism...This will cause the throttle to rise...I don't know what problem you had before replacing these components but nothing should magically go bad while doing it unless it is a faulty new part...Try removing the TPS ..,INSPECT it to see the plastic lever operation is in correct timing with the lever it is mounted to ...Look close with a light to see what I am describing then carefully connect it....I've seen it happen before...If not the IAC..( idle air control sensor )..will cause it to have a high idle if it is bad....),,maybe it was accidently disconnected .....GOOD LUCK..

You check fuel pressure?

OBD Codes in ANY Module?

All Emission Monitors Run clear?

Look at a trouble chart for the IAC problem

I do not know what having the computer remanned means

If it was replaced or not, it may need an update flashed

Did you Google the problem & check nissan forums?

Slip into service bay at a dealer, from the outside & ask a
tech,I do that all the time,no one will stop you,your going to
parts dept (right & got lost)

Before buying a ECM for the car I would do a smoke test on the vacuum line to be sure there is no leaks and causing the idle to very. Hope this helps.

TPS probably not cause surging idle. Could be IAC motor, could be MAF sensor. If you dont have a check engine light I would be thinking IAC motor.

As a factory Nissan trained Technician with dealership experience - it can be many things, but it sounds alot like a mis-adjusted or faulty TPS, and/or a faulty IAC(Idle air control) valve - I'd try the TPS and set to appx. .50 vdc (.47/.49) Volts DC and if that isn't it, I'd definitely look to the idle air control valve ( allows for air bypass - sometimes called bypass air control valve). May then need base timing and idle set at shop with OBDII ignition disabling option, for seting timing and idle, otherwise computer won't allow proper setting...then if connector to IAC is OK - should be just fine...