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The coolant in the valley evaporated so I re installed the coolant temp sensor with the correct sealant. Ran/drove the car for an hour, no leak. I am pretty sure if it was the intake manifold was the issue, there would have been a leak. I am going to drive it the rest of the week and see if the...

Thanks for all of the replies. I found a permatex for high heat/high pressure but took some pics and may need to fix something else first. First pic should be where you can see coolant residue near temp sensor/threads, second should be behind alt. Looks bad can anyone confirm what needs to be...

I searched but was unable to find this issue. I am noticing what appears to be a coolant leak from the coolant temp sensor on the coolant crossover. It appears the coolant is spraying out of the sensor threads and getting on the alternator. I have the aluminum crossover and installed a new...

I was just on YouTube because I was looking for a taller shift handle for my MGW and found a preview of their new handles. Just wanted to share (no I don't work for them).

Thanks again for the advice. Yeah $175 for mine.

It's the IAC w black vent. When I disconnect now the car immediately stalls/dies. Thanks again for all the help.

Final update everyone. So the Borg Warner IAC didn't work so I thought vacuum leak like everyone said. I fixed the hose that was dry rotted but figured I would spend more $ on a motorcraft IAC from rockauto just in case. I installed the motorcraft IAC but was getting fed up because the idle was...

Yes, I had battery disconnected when I installed the IAC but that took about 5 minutes so I may leave battery disconnected for a few hours today and restart tonight.

Quick update. Got a new hose and motorcraft IAC/new gasket. Started the car and still had high idle and hanging rpm. Let it run for 15 minutes and drove around the block and car still has the issue. It must be something further down the evap since I definitely isolated it there. Any common...

Found where the hose went, 12 o'clock inside fender liner. Waiting to get motorcraft IAC and I should be back in business.

It is a 99 GT. I think ill be looking for the VMV in the fender then. At first glance behind the liner I only saw metal plumbing from what I thought was the AC evaporator, no rubber hoses.

Will be looking for this during the week/this coming weekend.

Just plugged the evap line at the TB and idle went to normal. Now I just need to find where that hose ends up and buy a new hose to route from the tb to the evap canister. Thanks and please let me know if there's a diagram/pic of where the canister is located. I keep reading behind wheel well...

I changed the pcv in the past year but the hose from the back of the throttle body to the evac system is dry rotting. I was trying to find the evac box to replace the entire hose but I was looking under the fender liner BEHIND the wheel and didn't see the square evac box. Is it closer to the...

I have checked for vacuum leak. I have one hose that is dry but doesn't seem to have a leak, it's the one that goes from the back of the throttle body to the passenger side fender. I bought the IAC at advanced auto so it sounds like I may have to go get the motorcraft. Did you have the same...

Hey guys, Just to start off I searched a bunch of forums and used this wmburns post as a start: http://www.allfordmustangs.com/forums/4-6l-tech/49661-your-mustang-stumbling-dieing-idle-idling-rough-14.html#post2260649 I came out of work the other day and my car had a high idle, shifting...

Thanks for the info. Ill def check where some recent work was done. Got the new battery, alt and idler pulley in, battery tested at 12.94 volts, 13.97 with no load and 13.9 with high beams. AC definitely an issue so not worried about it until I fix it. Thanks for the help everyone.

The pulley seems smooth. The idler pulley was wobbly though and tensioner was missing a bolt so I picked these up:

Trinity, my plan is to check all the pulleys while the alternator is out. I already can tell that the upper idler pulley is a bit wobbly and I may need a new tensioner pulley (missing the bolt to release tension, had to use a temp bolt). Once I have checked/replaced the pulleys, I'm going to...

Trinity, so the A/C could be blowing ice cold but the compressor could be bad? Would the seized bearing make the pulley cause drag? I'm just trying to figure out how the alt went bad and the battery drained from the seized compressor. My car was running strong on the highway and then all of a...