Rough idle and stopping

Asked by Mar 02, 2017 at 09:25 PM about the 1989 Dodge Dakota

Question type: Maintenance & Repair

I have a 1989 dodge Dakota 3.9 v6.  I am
having issues with idle and stopping.  It idles
very low in park or neutral but when I out it in
reverse or drive it wants to sputter and die.  
Also loses power while driving.  Have to
feather pedal at stop sings and lights to
keep running.  I replaced idle speed control
motor, throttle position sensor,  replaced all
vacumn lines,  and removed cat converter
and straight piped it.  No change at all.  I had
about 1/4 tank of gas and I filled it back up
and it ran fine. When I got back down to 1/4
of a tank again problem started back up so I
figured maybe a bad tank of gas.  So I filled
it back up and put a bottle of heet in it and
no change at all.  Any suggestions will help.

18 Answers


Should check the fuel pressure, may have a bad fuel regulator or fuel pump. Sounds like a fuel regulator to me, but I like doing some testing before putting forth money into it.


could be vapor lock , as you use the gas in the tank the volume needs to be replaced with air , I guess loosen the cap to see if it makes a difference , Spray some carb. cleaner down the throttle body that can help , see if there's any codes , let us know what happens

No check engine light showing so can't read codes it did it for a while then put new gas in with a fuel treatment then started again drives fine going down the road but in idle and stopping no luck


Driving good down the road, then it is not a fuel regulator or fuel pump. The idle air valve and port in the throttle body may need a good cleaning.


Also there is a idle speed control motor on there. Should look at that.

I replaced the idle speed control motor just released gas cap and No change

Sometimes going down the road it will lose power like something is clogged have to release pedal and push again


Oh, I see you replaced the ISCM, sorry, but check out that Idle Air Control Valve. It is best to take it out, and clean that port. Best to take the throttle body off to do this. Probably just replace it, but it is important to do a good job cleaning out that port. And the red bottle of Heat is what you want to use for moister in the gas. Not the yellow bottle.

I used the red bottle yesterday I made sure all battery cables were tight


Idle Air Control Valve needs to be looked at.

If I unplug the idle speed control motor it idles fine but does the same with starting and stopping where is the valve located google didn't show much in pictures


It should be around the throttle body. This is what it looks like.....

1 people found this helpful.

I replaced that bran new (idle speed control motor)


Yes all is bran new


Ok then, another cause would be the EGR system, or the air injection pump system.

1 people found this helpful.

The EGR Valve can affect the way it idles and make it die. If the EGR is all carbon up not allowing the pentel to close it would idle rough and can make the engine die. If the EGR is good and all related parts, then it is just a matter of taking it off and cleaning the Valve and the port it sits on of the carbon deposits. You may need a vacuum pump to see if the EGR is good or not.

Ok will check it

Your Answer:


Looking for a Used Dakota in your area?

CarGurus has 144 nationwide Dakota listings starting at $1,995.

Postal Code:

Dodge Dakota Experts

  • #1
  • #2
    Samantha Brown
  • #3
    Justin Doucette
View All

Related Models For Sale

Used Ford F-150
129 Great Deals out of 12,050 listings starting at $1,900
Used Ford Ranger
6 Great Deals out of 331 listings starting at $1,999
Used GMC Sierra 1500
67 Great Deals out of 8,271 listings starting at $3,600
Used Chevrolet S-10
6 listings starting at $1,500

Used Cars for Sale

2010 Dodge Dakota For Sale
11 listings starting at $8,979
2009 Dodge Dakota For Sale
6 listings starting at $7,450
2008 Dodge Dakota For Sale
29 listings starting at $4,295
2007 Dodge Dakota For Sale
24 listings starting at $1,999
2006 Dodge Dakota For Sale
23 listings starting at $4,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.