98 jeep wrangler 2.5 Started with check engine light, code was 122 which was supposed to be throttle position sensor. replaced TPS ran good for a few miles and it came back on. It also had exhaust leak, thought that it might have been causing problems so had that fixed. The engine light was reset and ran great for about 15 miles and came back on. The engine is also jerky as if it cant make up its mind on whether its supposed to speed up or slow down.

Code 122 is for a low signal coming from the TPS. Since you have replaced the sensor, the problem may be in the wiring harness. The signal would need to be checked.
Code 405 is also a low signal coming from the EGR valve. Same thing, you need to check the signal with a scanner or volt meter.
And when the computer is not getting an acceptable reading from the TPS it uses a known good signal to bypass the sensor which will cause the idle speed and shifting problems. The computer does not know when you open the throttle.

The problem is one of your coil packs is bad. Don't throw money into sensors, they are false codes. The problem is coil packs.

A code P0123 may mean that one or more of the following has happened:

• TPS not mounted securely
• TPS circuit short to ground or another wire
• Faulty TPS
• Damaged computer (PCM)

Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, carefully inspect all wiring and connectors that lead to the TPS. More than likely the problem is with the TPS wiring. Check the voltage at the TPS (refer to a service manual for your vehicle for this specific information). If the voltage spikes or is too high (over 4.65 volts with key on, engine off), then that is indicative of a problem. Carefully trace each wire from the TPS wiring harness to check for breaks, rubbing against other components, etc.
A code P0121 may mean that one or more of the following has happened:

• TPS has intermittent open or short internally
• Harness is rubbing and causing an open or short in the wiring
• Bad connection at the TPS
• Bad PCM (less likely)
• Water or corrosion in connector or sensor

Possible Solutions 1. If you have access to a scan tool, see what the idle and WOT (wide open throttle) readings are for the TPS. Check if they're close to the specifications mentioned above. If not, then replace the TPS and re-check.
2. Check for an intermittent open or short in the TPS signal. To do that, you can't use a scan tool. You'll need an oscilliscope. The reason is because scan tools take samplings of many different readings over just one or two data lines and can miss an intermittent drop out. Hook up your oscilliscope and watch the signal. It should sweep up and down smoothly with no drop outs or spikes.
3. If no problems were noticed, perform a wiggle test. Do this by wiggling the connector and harness while watching the pattern. Does it drop out? If so, replace TPS and re-check.
4. If you have no TPS signal, check for 5 Volt reference at the connector. If it's present, check the ground circuit for open or shorts.
5. Make sure the signal circuit isn't 12V. It should never have battery voltage. If it does, trace circuit for short to voltage and repair.
6. Look for any water in the connector and replace TPS as necessary.
P0152 Oxygen Sensor Circuit High Voltage (Bank 2 Sensor 1)

check the throttle possioning sensor on the throttle body that can cause alot of things

probably neither. You should do a compression check, and check your transmission fluid for dicoloration and metal shavings.

SOUND LIKE TPS SENSOR.PROBLEMS.SCAN IT.TO LOOK FOR TPS FAULT CODE.ALSO CHECK TPS SENSOR WIRING.AND MAKE SURE ITS NOT LOOSE.

P0122 - Throttle Position (TP) Sensor Circuit Low Voltage
P0123 - Throttle Position (TP) Sensor Circuit High Voltage
without checking it 1st I would guess the TPS is most likely defective.
P0432 - Catalyst System Low Efficiency Bank 2, you may have to replace the Catalytic convertor, it may be worn out,
A WORD OF CAUTION: Don't use aftermarket cats, they tend to reset the same code due to compatibility issues, also replace the cat monitor sensor (looks like an O2 sensor) located just to the rear of the bank 2 cat converter.

did you check voltage to sensors if you need help with proedure, contact me, or you may try patrs houses on line in how to section.

If it was originally scanned by auto zone and they said Throttle Position Sensor (TPS),i would go back and have it scanned again,this will tell you for certain what it is.Try and get the code number and definition written down.If it were TPS again,the sensor itself would need to be replaced unless the cost was prohibitive,or the wires to and from the sensor and PCM (vehicle computer),ohms checked for continuity first.Eliminating the wires leaves 2 entities in the circuit,the PCM or the TPS.Checking circuits is costly in labor dollars.Good luck.

There are various reasons that this could happen:

1. Your throttle body needs completely cleaned and decarbed
2. The Throttle Position Sensor, IAC might be dirty
3. o2 sensors might need replacing.

How many miles does your vehicle have?