yorkite

Hey all, for the second time now, when I started my '87 this morning, the rpms went all the way up to 2100-2200, as usual, and wouldn't go down.
When this happened a couple months ago, I unplugged the IAC, and that fixed it. Not the case this morning, I had to put it in gear and kill it with the clutch, then unplug the battery for a minute. This is only the second time this has happened. Any thoughts? Jeep specs are off to the left.

00jeepXJ

Sounds like your IAC is dirty. You can clean it by taking your throttle body off and taking some time to really get in there and clean it out with the right kind of cleaner. Get some carb and choke or brake clean at worst. If you can find mineral spirits that works really good also. See if that helps you out because some times they just get really nasty in there and like to act up.

tannerp89

i assume you replaced the IAC a couple months ago when it did this (you should have, if not, do so now) so it shouldnt be dirty already, if the problem persists, unplug the TPS and see if the RPM's drop back down. if so its the TPS...

yorkite

I will try that and see if it works...Thanks.

yorkite

I should have mentioned that when this happened, I tried unplugging the IAC and the TPS at the same time because doing just one did nothing. I have an extra of each I grabbed at the last junkyard run, and will clean them like 00jeepxj says and wait to see if it will happen again.
The throttle linkage isn't sticking, I know that much.

fishtaconc

get the EFI safe cleaner, less chanc eof messing it up and not knowing

jeeptogofast

Mine was doing the same thing and it was a dirty TPS

98 JeepJeep

unplugging it wont drop the idle if the pintle is stuck open.

yorkite

Thanks to all for the help!