Truck Trouble, High Idle
I'm having trouble with my '04 quad cab ram.
It's got 55k miles on it. I've only had the truck for about 6 months but that's 3 months out of a 3month/3000 mile used truck warranty.
The truck has seemed to run real well. Before, it would crank and when warm would idle down to around the 600-800 RPM range but this past weekend it started idling at at least above 1000 RPM. Not only that, but instead of warming up and dropping, it will sit at 1200 for let's say, 30 seconds and then will increase to 1500 RPMs. It won't drop from there. It's way too high. I can put it in drive, take my foot off and head down the road with no gas going 25 MPH.
I'm a shade tree mechanic at best but I don't know where to go from here. If it's not transmission troubles yet, I think it's going to cause some. It's downshifting a little hard when I come to a stop because the engines running so high. shifting from Park to Neutral, Reverse, or Drive seems to be killer on the transmission.
I had a cold air intake on it for awhile but have taken it off and replaced the factory resonator and filter box. I've reset the computer a couple of times during the whole process but it's still struggling. In fact, I had a check engine light last night but paniced and reset the computer before i read the code.
Any help would be greatly appreciated.