Problems after replacing IAC and TPS
Hey guys, Im having trouble with my truck and don't really know what is going on and Im looking for a bit of insight. First off, my truck is a '99 Dakota Sport 5.2L.
Just a couple weeks ago, I replaced the IAC and TPS because I was having a problem in which the rpms would stay up high when I pushed in the clutch. It turned out to be the TPS as far as I could tell. Regardless, after replacing those two things and resetting the PCM, the problem went away. For a day.
On cold starts, the it seems to struggle idling. When driving or giving it gas, it is perfectly fine, but as you let off the gas, it struggles to idle. But it will only do this for about 2 miles of driving. Which makes me think that it is only an issue while in Open Loop operation. But maybe that has nothing to do with that.. I don't know. Anyways, after about 2 miles, all is well and there is no problems. However.... Once I am within a couple of miles of work/home (after about 15-20 mins of driving) I will go to shift and as I take my foot off the gas and push in the clutch, the rpm's jump up to 3000 like my foot is still on the gas for 2-3 seconds, then falls back down to normal. Since it seems to start to do this consistently near the same spot every day, I have kind of played with it to get a better idea of what is happening. Once it starts to do it, I will tap the gas while in gear and I can feel and hear the engine revving like my foot is holding the gas for 2-3 seconds. Similarly, while holding the clutch in, I will tap the gas and the rpm's jump up to 3000 for 2-3, again, like I'm stepping on the gas. I am quite sure the throttle is not sticking, because it snaps right back. And it only does this after 15-20 mins of driving.
I don't know if these issues are related, but they both started right after replacing the IAC and TPS and resetting the PCM. Any Ideas?? Any help is greatly appreciated. Thanks guys.