Sometimes truck won't stay idle when i start?

Question:
I have a 99 dodge truck dakota 3.9 v6 and every once in a while when i go to start it, it starts but won't stay idle. i go under the hood and disconect the - negative cable to the battery and i wait a minute, connect the battery terminal and the truck starts and runs fine till the next day or two, then i repeat the process of the removal of the - negative battery cable. No dash lights or check engine lights come on. Its frustrating and becoming a pain. Got any ideas.

Answers:

Better motor to build?

You could have something as simple as a weak battery. With a weak battery during cranking, the voltage to the PCM will drop below 9VDC and the memory will be erased causing the PCM to do an idle relearn which can cause dying. You could also have a dirty or defective IAC (idle air control) motor. The first thing to do is get the battery load tested and if it's OK, then make sure that your battery connections are clean and tight. If the battery tests weak replace it. Try this first and go from there. Hope this helps!

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IAC Valve sticking? (idle air control)

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If your problem is the engine seems to run on 3 cyl instead of 4 then check the rotor and cap plug wires and the plugs and compression
cap =worn contact
plug wire =worn or broken inside casing
plugs =one bad plug
compression = one dead cylinder no/low compression

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REPLACE THE IDLE AIR CONTROLE VALVE .

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clean your trottle body , injectors and tune her up.save money dodge tech. level 4 certified

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