Weird idle and surging

[ADudeOnSkis]

Yo dudes. I recently replaced my tps with the Mopar part (had some ***** Napa part in there). What was happening, it's it would start fine, but if left to idle, after 2-5 minutes, it would start to idle down and then sound as if it were trying to die (actually sounded kinda like a cigarette boat engine) for about 3-7 minutes (if left to itself). During this time, it would try to compensate for the loss idle, revving itself up but then dying back down again. After 3-7 minutes of yous, it would finally reach proper idle speed (although it would waver some), and would run fine until I shut out off. When I'd start again, the same thing would happen (to me suggesting that out has nothing to do with the engine being cold). If I just got in and drove (not waiting for it to do its little skit), it would buck and surge under throttle until I got into second gear (5 speed nv3500) and floored it till close to redline (I'm guessing as I still don't have a tach).
So I replaced the Napa tps with a Mopar part, and it was fine the first time I fired it up. And then started with this crap again. Other things I've done are;
Fixed plenum
New IAC (damaged original when doing plenum)
New map sensor
New cap and rotor (was waiting on plus/wires because I was strapped for cash at the time)
New downstream O2 sensor

I think it's electrical/fuel related, but I'm at a loss add to what specifically, especially because of how it goes away after a (mostly) consistent amount of time, or doing something specific.

Any thoughts?

 

[dodge dude94]

You've made no mention of if you've reset the PCM after all this.

 

[ADudeOnSkis]

I have, every time.
I installed a Mopar tps, no problem the first drive, then back to these shenanigans.
Crawled under her this last weekend to replace the throw out bearing, and in moving the exhaust out of the way, we realized that there's a ton of it rusted out between the muffler and cat. My dad thinks that's a pretty likely cause, I'm not as convinced but now I need a new exhaust anyways.

 

[mda8569]

How old are those wires? Might be getting arching or cross talk.

 

[ADudeOnSkis]

Not sure. Planning on replacing them with MSD 8.5mm next payday. I did however route them properly.

 

[RAMsport2001]

I have the exact same issue, plus and wires (oem) make it a little better. I have heard that I can be the fuel pump.

 

[RAMsport2001]

Yo dudes. I recently replaced my tps with the Mopar part (had some ***** Napa part in there). What was happening, it's it would start fine, but if left to idle, after 2-5 minutes, it would start to idle down and then sound as if it were trying to die (actually sounded kinda like a cigarette boat engine) for about 3-7 minutes (if left to itself). During this time, it would try to compensate for the loss idle, revving itself up but then dying back down again. After 3-7 minutes of yous, it would finally reach proper idle speed (although it would waver some), and would run fine until I shut out off. When I'd start again, the same thing would happen (to me suggesting that out has nothing to do with the engine being cold). If I just got in and drove (not waiting for it to do its little skit), it would buck and surge under throttle until I got into second gear (5 speed nv3500) and floored it till close to redline (I'm guessing as I still don't have a tach).
So I replaced the Napa tps with a Mopar part, and it was fine the first time I fired it up. And then started with this crap again. Other things I've done are;
Fixed plenum
New IAC (damaged original when doing plenum)
New map sensor
New cap and rotor (was waiting on plus/wires because I was strapped for cash at the time)
New downstream O2 sensor

I think it's electrical/fuel related, but I'm at a loss add to what specifically, especially because of how it goes away after a (mostly) consistent amount of time, or doing something specific.

Any thoughts?[/QUO




any update?