My 02 dakota 3.9 automatic has been doing a few things odd lately.Ofyen but not everytime.
As coming to a slow stop the rpm guage goes down a lot to 300or 400 an back up to around 650..
If I stop fast it's less likely to drop but if I go very slow it drops..an a few times dropped to point of almost dying..would have if not given gas.
I've cleaned up the throttle body an iac an tps an even tested the tps..put addative in tank also..
..there was emissions code now vleared but may not be related...incorrect purge solonoid ..

What do I need to look at next ?

 

Put used map sensor in an it seems to have helped along w moving the tps sensor around some when off like the spring needed a snap or two..
It came back after driving around 80 miles as fuel got to low area,not sure if that is a factor .
I may cIange out IAC.

Any suggestions on what else to check

 

Check level of your trans fluid!

 

Already have .
It's normal.
I put different TPS on an the reading went from 10.6 at idle to 12.5

What is the normal reading on scan tool when in idle?

 

If it's any solace my truck has been doing similar things for years. When moving slowly and stopping (think parking) it may stall completely. No roughness, just a dropping idle that results in a stall. Starts right up and is fine. I've had no codes thrown that I know of and I haven't bothered to try and figure it out either. Annoying, but it has never been more than that and I've just accepted it. I've had the truck since new and maintenance has been done as required, but I'm also not a nut like I used to be back in the 60's and 70's! Occasional injector cleaner dropped in the tank and plugs and wires have been done throughout the stalling.

 

IAC would be suspect, it causes the engine to stall if the step motor does not work properly. This is only if the engine won't idle. Mine never threw any kind of code.

 

This may possibly be a fuel related issue.

When the tank is low at 1/8 th or 20%or less it seems to happen more .

I filled it 75% an no problem an I went super slow to a stop with ac on [usually caused it more] an it remained at normal idle at stop..
When gas level is low an coming to slow stop it starts to stutter or go under 500rpm unless I'm coming to a fast stop....does ok then..i give gas an it stays back at the 670 rpm area normal range.


What's happening? Is it loosing pressure as I stop ,only with low fuel ?
Any info is appreciated

 

I had injection cleaned out at shop an cleaner in tank at 1/2 full an ran it till down to 1/8th an..no problems at stops..at all---then ..again as coming to slow stops after 1/8th it hesitates an starts to stumble under 500rpm eradfically unless I give gas or stop fast..

Is my pump doing this?
What psi should it be at?
Any other ideas?

 

Is 46 or 47 pretty good?

 

I'm gonna replace pump an clean out the gunk in tank...Got to be junk in tank doing this when it gets low..at half tank no problems !