Ihave a dodge ram 1500.after driving for a while and I put it in neutral the idle goes up and down on it's own until I put it in gear again.

Try changing the fluid and the filter (inside transmission pan) and see if that helps.

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Sep 8, 2009 - My 99 Dodge 2500 Ram won't accelerate..transmission is NOT slipping,.... It has been running fine and the check engine light even cleared itself yesterday.... So it wouldn't go into first gear and then 3 minutes later my check engine ... I have a1997 Dodge Ram 1500 with a 5.9L instead of the stock 5.2L. It ...

Dodge Ram Idle and Stalling Problems - Car Forums at Edmunds.com

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Aug 17, 2011 - 30 posts - ‎25 authors
Learn more about Dodge Ram Pickup 1500 at the Edmunds.com ... The crank sensorwas put on however it started stalling again. ... The truck starts fine, but will only runat 2000's RPM and only then if .... Then as I start driving about 1/3 of a mile go dead again, I knockout of gear, crank back up immediately.

WILL NOT GO OVER 30MPH WITH PEDLE TO METAL ...

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I WAS DRIVING FINE AND THE CAR ACTED LIKE IT GOT STUCK IN ... Then the transmission didn't want to change into 2nd gear. .... Whenever i start up my car theabs and esp light turn on and when i try driving it doesnt go over 30 mph even .... in neutral but not it just wont go up hills and i think it has something to do with

transmission shift solenoid, google (2012 dodge ram 1500 5.7 transmission stuck in 4th gear) theirs been a lot of problems,
check out forum below
http://www.ramforumz.com/showthread.php?t=74392
press the helpful button

There are a few possibility on this one. If you run it out of gas or really low on gas you could of sucked junk up from the bottom of the tank and you will need to replace your fuel filter. Another is that your fuel pump us going bad and you would need to check the pressure. Your throttle position sensor may have gone bad. Your idle control valve is another. Your map sensor or mas sensor could be bad

No the idle issue is not the TPS, it is a sludged up throttle valve and automatic idle speed control air bypass valve. The procedure below should cure the idle issue. As far as the vibration goes this needs a hands on diagnosis by a good noise and harness trained tech, tire shops are good for this technican as well of course the Dodge dealer. Find below the cleaning procedure for the throttle valve and idle valve
Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional

Neutral safety switch. Its purpose is to allow starter to engage in Neutral ONLY

your system needs to be recharged

Sounds like you may need a TPS (throttle position sensor).

The sensor could be failing to read the lower pressure when the engine RPM slows down. Or the pump could be failing. I would replace the sensor and see if that doesn't correct the problem

Idle flare is normal on all newer fuel injected cars. I think maybe you got a little paranoid,probably first spark plug change done by you. Gas milelage is easily explained in 2 ways, one the gov't is making the gas companies put oxygenated fuel into the gas & 2 you could go with a set of bosch oxygen sensors,pick up 15% more gas mileage