Sometimes the truck will not stay idle when I start?

I have a 99 Dodge Dakota truck 3.9 V6 and occasionally when I go to start, begin but will not stay idle. I'm going under the hood and disconnect the – negative battery cable and wait a minute I connect the battery terminal and the truck starts and works fine until the next day or two, then i repeat the process of eliminating cable – battery negative. No dash lights, or check Engine lights come on. It's frustrating and become a pain. Do you have ideas.

You could have something as simple as a weak battery. With a battery weak during startup, the voltage will drop below the PCM 9VDC and memory be erased causing the PCM to make an idle relearn that can cause death. You could have a dirty or defective IAC (idle air control) motor. The first thing to do is get the battery tested and if it's OK, then make sure your battery connections are clean and safe. If evidence of weak battery replacement. Try this first and go from there. I hope this help!

Optima Batteries OPT D34/78 D750U 12V Deep Cycle Top/Side Dual Terminal Post Battery, Yellow Top $173.40 Optima Batteries 12 Volt 750 Cca Yellowtop Performance Car Battery – Optima Batteries D34-78…

RedTop; Battery $139.70 Optima Red Top 34/78 Sealed Automotive Performance Starting Battery…

Optima 8022-091 | Dual Terminal Battery | Red Top 910ca/720cca $134.60 The looks alone generate plenty of buzz. But it’s the patented SPIRALCELL® Technology in OPTIMA RedTop batteries that’s truly worthy of praise. OPTIMA RedTop batteries are built to withstand the abuse Trucks, SUV’s and 4×4′s experience on and off-road. SPIRALCELL Technology immobilizes the internal components of the battery, enabling OPTIMA batteries to withstand incredible amounts of vibration. …

Johnny Ray JR-600 Marine Zinc Plated Battery Terminal $12.49 Zinc Plated Battery Terminals Zinc Plated For Accessory Wiring Provides safe , secure wiring between battery and electronics. Prefect for sensitive electronics and provides an easy method for connection and disconnection. positive and negative terminals contain 4 separate terminals and spade lugs. Necessary screws and eyelets included….