Surge in rpm's
 

when im driving down the road at around 50mph and lift my foot off the gas the rpm's jump like its downshifting and then drop. any idea what this would be. its a 2000 ram 1500 5.2 with automatic transmission

Tps..

throttle positioning sensor right? not to good understanding letters.

sorry about that yes throttle positioning sensor that mostly likly that problem

hope thats it for you

i would it it from a store that you can take it back easy if that not the problem

okay that should be easy enough to get to a store friday. and any idea how long time wise to change tranny fluid/filter? my truck sat a while and need to get it done.

any other ideas of what i should do after it sitting. just passed through inspection so all that stuff should be fine.

Plenum? Fluid changes? Maybe some fuel injection cleaner. (Seafoam?) how long did it sit?

Test the tps with a multimeter.
Set it to 20v dc (or 10 if it goes that low).
Back probe the tps wires with the key turned on.

Put the + probe into the purple/white wire and the - probe into the black/light blue wire. The meter should read about 5 volts.

Now put the + probe into the orange/dark blue wire.
With the throttle closed the meter should read between 0.5 and 1.5 volts.
Now slowly open the throttle all the way while watching the meter. The voltage should have a smooth sweep all the way to 3.5-4.5v (about 4.5v at wide open throttle).
If the voltage doesn't change, is erratic or goes outside of 0.5-4.5v then your TPS is probably bad.

If you don't have a multimeter and can't afford one then I'm pretty sure you can do the loan a tool program at advance to get one for free (you just have to return it when you're done with it).

plenum i think id be able to do. did oil/radiator fluid change, rear axle was completely apart so that got new fluid. my gas tank had maybe half a gallon of gas in it but thats been run through. it sat for around 3 years.

yea i dont really have money for a multimeter at the moment. but i have plenty of friends that have them so ill be able to get one. hopefully its nothing to bad getting this back to normal.