Hello, I am new to this forum and am having a difficult time with my 98 ram with the 360. It will start up fine and then after a few minutes it will start to idle really bad and sometimes it will stall and other times it will come out of it and ilde fine again. It has a bad hesitation at parking lot speed(it is very hard to drive through a parking lot because it wants to spit and sputter really bad) it takes right off if you give it more gas and it runs fine going down the road. I have replaced the TP, IAC, both O2 sensor(has no cat) cap, plugs, wires new computer, new grounds, cam sensor, PCV and there is no puddling of oil in the intake. This is where it gets wierd if I remove the ground from the battery and turn on the head lights(drains the computer of memory) and wait about 10 minutes then hook everything back up the truck will runs perfect for about 2 days and then starts to run rough again. I need some help I am lost as what to do next. Any help would be awesome.

Thanks
Chuck.

 

Pre-cat 02 sensor going out.

And yes I know you said you replaced it.

What brand did you use? It's either that or the PCM.

 

I am not sure what the brand was for the O2 sensor and the computer was replaced already. Why would it matter what brand O2 sensor is installed?

 

It was a Bosch O2 sensor. Thanks.

 

Our trucks don't like Bosch.

Replace them with NTK 02's and the problem will likely go away.

 

Denso is acceptable as well.

Absolutely no Bosch tho. No Bosch anything on these trucks. Except windshield wipers, they make good windshield wipers

 

^They do make good wipers. I have a set on my truck.

 

LOL windsheild wipers

 

Try unplugging the front O2 sensor, and driving it for a couple days. That will tell you if the sensor is at fault.