My engine had been idling a little funny for a couple weeks - kind of cycling up and down then eventually steadying out. This weekend things changed - now it stalls soon after I start it. Cleaned throttle body and IAC motor last night but that didn't fix it. Any ideas?

 

throttle positioning sensor?

 

tps sensor

 

Thanks guys, here is an update: Went to parts store tonight and got a new TPS. Was fixing to install it and started the truck again to move it in the garage - it stalled once and then started on the second try and ran fine....(?!) Drove it for awhile and now it idles great. New TPS is still in the box.

Maybe there was some residual crud in the throttle body that finally cleared or a loose electrical connector?

Going to drive it awhile and I will add updates to the post if I learn anything new. Thanks again!

 

My 2002 ram 1500, 208k miles, 4.7 v8 experienced the same problem this morning. Started without incident this morning and went to the store to run some errands. Coming back to the truck at the store. The truck would Start, then run low rpms, then stall. I could not keep the engine from stalling without pressing the excelerator to increase the rpm. Let off the excelerator and the truck would stall. A couple of days before the truck stalled on start up only once. Started again and the truck ran fine.
Today, luckily, I had green lights in my favor on the way back and not much traffic. If I had to stop, I used both the brake and very light gas to keep the rpms up.
I had an original battery which was corroding on the negative terminal and appeared to be leaking at the same spot. The battery was maintenance free, but I could pop the caps and found two cells a little low. I replaced the battery, cleaned the terminals and applied some corrosion resistant gel. I cleaned the throttle body and replaced the pvc valve. I also cleaned the hard plastic tubing that goes to the pvc valve. This tubig has an s-shape and was also clogged. I removed the tubing and I used a piece of 14 gauge wire to feed through the tube. I tied a piece of string to a loop on one end of the wire, and tied a small strip of cloth to the other end of the string, then i tied another peice of string to the other end of the cloth. Keep the knots tight and no bigger than the inside diameter of the tube, and trim the excess cloth and string at the knot. Once I pulled the wire through the tube, I untied the wire and tied the first piece of string to a stationary object. Hold the tube at the first turn to keep from stressing the turn, and hold the end of the other string with your other hand and you can slide the tube back and forth across the cloth. I needed to change the cloth several times, until it would come out without much gunk and was still clean. Intialily large particles of gunk came out of the tube. I then replaced the clean tube, and the truck runs great. I'll probably go ahead and replace the EGR valve next week. If you have trouble again check the PCV valve and clean the tubing. It worked for me.