2002 TJ 4.0L
Hello all, lately my jeep has been acting very funny on me. About a week ago I noticed that after I had driven the jeep (duration didnt matter) and went to park it, as I put it in park, the rpms would shoot up, then slowly go down. It went from doing that all of the time to, now when sitting idle at a light, or just in park, the rpms will gradually rise, then fall, then go back up then down.
What makes this more odd is I noticed that when I go to turn on my heat (for one the heat isn't working properly it is only coming out of the defrost vents) the rpms will go up, and the pressure of the heat when it exits the vents will increase. Then when the rpms drop, so does the heat pressure exiting the vents.
I'm not sure if this is a IAC issue, or TPS issue. I know my throttle plate is clean cause I keep it clean. I'm almost wondering if this has something to do with those vent hoses having a leak? But I'm not sure if that can cause spiratic high rpms or not. Not to mention the heat only coming out of the defrost vents issue occurred the end of last winter. This high rpms didn't occur until a week ago.