I have a dodge ram 1500 Runs fine until it warms up,then when i come to a stop the rpms drop sometimes stalling.also when driving around 55 mph it bogs down and starts popping. I changed the crank sensor and tbs. Any other suggestions?

 

Welcome to DF.

Could be the IAC or the pre-cat oxygen sensor. The IAC only really functions at idle, making it a suspect, and the oxygen sensor only kicks in after warm up, making it a candidate as well.

Will move you to the correct spot for more/better answers.

For future reference:
https://dodgeforum.com/forum/dodge-r...irst-free.html

 

I think jasonw is bang on.

That's right around when the PCM changes from closed to open loop I beleive. That's when all the big important sensors do their jobs.

 

X2. Is the check engine light on?

 

O2 won't generally set a hard code, until it is REALLY bad. For a test, simply unplug it, and drive the truck. If that particular problem no longer presents itself, replace the sensor.

Just for clarity:

Open Loop: This is the mode the PCM runs in until the engine temp hits 108 degrees, and all sensors report ready. (heated O2 are ready faster) Also, large throttle openings will drop the engine into open loop.

Closed Loop: When all parameters are where they are supposed to be, PCM will start paying attention to the O2 sensor, and adjust fuel mixture accordingly.

If the problem presents itself after the engine has been running for a few minutes, O2 sensor is the first place to start looking.

 

No codes picking up a new oxygen sensor Thursday and new pcv valves. Thanks for the reply.