Begging for help here. I have a 2001 Dodge Ram 1500 Quad-Cab Sport, 4x4 with a 5.2L 318 Engine. I have about 81,000 Miles on it. About 2 months ago I got a code for a ECT Sensor. I replaced the sensor and changed the oil, oil filter, transmission fluid, transmission filter, transmission gasket, front and rear axle fluids. I drove it for a little and immediately recieved a code for a GROSS EVAP LEAK. I replaced a few hoses and could not find it. I took it to the shop this week and they smoked the engine and found a 4-5 inch leak in the hose going into the charcoal canister. They replaced the hose and that fixed the issue of the code and the idling to a stall. During this period when I would leave the truck overnight and wake up at 5AM to go to work I would start to go up a hill about 1/4 mile from my house that would cause the trucks RPM's to get into the 3000's...this would start a violent bucking/lunging. The truck would shift gears and the RPM's would drop into 1500-2000. After the truck would warm up (a mile or two) the problem would not occur. I would find another incline that would cause the RPM's to get into the 3000's (Roughly 3400) and the problem would not occur. I leave the truck sit at work for about 12 hours and start it up and do not have the problem. Now I can not honestly say that I know the RPM's are getting that high when I leave because work is on a hill and when I leave it is all downhill. I would leave the truck overnight and I would have the same issue in the AM. I am completely disoriented as to what this may be. A temperature sensor? Transmission? Just to let you know it runs fine all the other times and there are currently no codes showing. Please let me know any and all suggestions. Thank you in advance for your time and efforts. If you prefer to leave a voicemail ( I know I hate long emails....LOL) you can call my cell 610.842.5180 I am outside Philadelphia. If I do not answer please leave a voicemail....my grandmother is very sick in the hospital and I may not be able to answer. Thank you again.

Bryan

 

I happen to just take the truck out....it was 1:30 P.M. and about 70 degrees. (Not cold out) The truck got to about 3000 RPM's and felt like it would not go and then it jumped to 4500 RPM's then back down to 2700 RPM's and then back to about 3800 RPM's... I immediately took my foot off the accelerator and they RPM's stabilized. I took it to a very steep incline and got the RPM's up and had no problems and the tranny shifted fine. I hope this may help direct us to the problem. Bad plugs? Wires? I have no idea.

Thanks again.

Bryan

 

tps maybe? thats just the first thing that came to mind. maybe someone will chime in with something else.