*ISSUE* Ford Broco II "ROUGH IDLE"

[Hellfighter]

Like the post says, i will just copy and paste over what i wrote on the bronco forum, nobody is helping me there.

I bought it from the original owner i am the second, Car has around 68100 Miles on it its a Ford Bronco II, IT idles roughly, Dies on me while at idle at some spots , and died couple times on me while i park in reverse if my wheel goes all the way to the right or left sometimes, and it died on me while i was turning and i had to quickly restart or i would have hit a curb, I cant figure out why the guage wont stay stable. It drops from around 900 - 500 or lower rpm and just bounces or so and you can feel on the shifter handle it kind of has rough shake to it, This car is a 5 Speed, I have replaced Radiator, waterpump, thermostat, sparkplugs, with motorcraft plugs, new bosch wires, new fuel pump, new fuel filter, Got a new distributor cap and rotor going on tommorow , I cant figure out why this car is idling bad.. i mean i got it for 1500$ and have been fixing many parts including wheels tires , shocks, weatherstripping, and just its starting to piss me off, Firestone told me he has no idea and to start on monday if i bring it in just to diagnose its 99$ but i dont want to go that way knowing he will just start saying part after part after part to replace... and making a huge dent in my wallet. I am a 21 year old kid so money saved is really good for a college student. So now this is why i made an account i really need some damn good advice guys, this car is really making me mad at this point, the muffler has to be replaceed next cause the damn rattle gets annoying now. Oh also i forgot to mention since today i changed out 1 rear spark plug on the furthest passanger side today, and cleaned the sensor in air intake just to see if that would make a difference , and had an adult mess around with throttle piece that opens and closes the throttle, now i hear a hummm that annoys the crap out of me when idling, when i drive its not there. Oh yeah and i also got a replaced I.A.C Valve, even though the fuel pump and iac still looked ok, i said to hell with it. So please help me get this damn car running, i only had it a few months and put maybe 1000 miles on it at most? cause it just runs terrible and i dont feel safe in it.

Here is a posting i did
http://houston.craigslist.org/cto/3466976227.html

I am not selling the car if i can fix the damn thing, i posted that because it started getting annoying, so please refrain from emaling or asking or calling me about it. It explains all the things i did to and whats wrong with it.

Can someone who is an expert please help me out.

[TheReaper]

What year was it built ? It sounds like a TB problem.

[Hellfighter]

Its a 1988 Model.

[Top Off]

Okay. It sounds like it should have the 2.9 EFI in it. I had an 87 that had similar problems. Mine wound up being an O2 sensor. Mine was intermittent and found if you disconnected my sensor the truck ran like that. Another 87 if you did that it killed the engine. Good luck

[Hellfighter]

Originally Posted by Top Off

Okay. It sounds like it should have the 2.9 EFI in it. I had an 87 that had similar problems. Mine wound up being an O2 sensor. Mine was intermittent and found if you disconnected my sensor the truck ran like that. Another 87 if you did that it killed the engine. Good luck

Where would this sensor be located at? i can replace that i looked online around 40$ for a new one. Cause from what i read its a PITA process just to test if it is the issue.

[Decibel JJ]

I'm thinking it could have a vacuum leak.

There was a common problem with loose electrical connectors on the top rear of the engine as well that it could be.

[Hellfighter]

Originally Posted by Decibel JJ

I'm thinking it could have a vacuum leak.

There was a common problem with loose electrical connectors on the top rear of the engine as well that it could be.

I have checked most vacuum lines in the engine bay that i could spot, all feel and look solid, i blown through them and no leaks. They look almost brand new. Which part of the engine electrical wiring are we talking about?