I just did this procedure on my '98 GT. It's an automatic and it didn't affect the shifting at all. I used the copper plug method and went with a hole a little larger that 9/32. I notice a definite improvement but I think I will try a little smaller hole at some point. The car is so much nicer to drive it's unbelievable. The car slows down just enough when you take your foot off the gas. I am not on the brakes nearly as much. Thanks to the guy who figured this out.
Fix your Slow dropping/hanging RPMs
- Thread starter magnum347
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Wow... this thread took off in the past couple days.
MustangEd.... I can send you another that'll make the difference even greater if you want it. I'm all for customer satisfaction bro... Check the hole with a drill bit to make sure it's 9/32"... if bigger... I'll send you a new one. Sorry about the broken bolt.
As for automatic xsmn mustangs... I dunno, but your welcome to try it.
Gotta go back finish installing/wiring my NX wet kit.
$7.50 shipped even to our Canadian brothers....
MustangEd.... I can send you another that'll make the difference even greater if you want it. I'm all for customer satisfaction bro... Check the hole with a drill bit to make sure it's 9/32"... if bigger... I'll send you a new one. Sorry about the broken bolt.
As for automatic xsmn mustangs... I dunno, but your welcome to try it.
Gotta go back finish installing/wiring my NX wet kit.
$7.50 shipped even to our Canadian brothers....
Do these work with aftermarket plenums? I have an accufab and I was looking at the attached pic and it seems there is only one hole in the IAC...correct me if I'm wrong.
View attachment 513793
View attachment 513793
i cant wait to get mine, to bad my car just broke. im curious about how you made mine for the bullitt, i keep seeing something about different sized holes, i know you had a bullitt so i assumed you knew what i was looking for, can you tell me how you set it up in terms of small/large or quickest to slowest dropping rpm's?
rkutzner
Founding Member
Heck, I just gave him 10 bucks ! If it does anything like those running it said, it's worth every penny !!! Can't wait to get it 
Pughman
Member
mity2
I like Pro3 and all I got was this crappy CT.
any one here using this plate have a custom dyno tune done? I'm wondering if this will affect any type of air/fuel settings done to my chip (LaRocca's tuned). I'd really like to do this mod, I've hated the RPM hang up for years. Also: I used to have an auto, now a TKO with a spec aluminum flywheel and it still does the hang up, if not worse than before.
BTW...my friend had a 97 cobra, didn't hang up at all? Problem with 98 and up? Or just a GT problem? Thanks
BTW...my friend had a 97 cobra, didn't hang up at all? Problem with 98 and up? Or just a GT problem? Thanks
I do have a custom superchips tune for my car...I installed the plate about a couple of weeks ago and the only thing I have noticed, that my car never did before, is when I start the car cold and turn the air on, it stalls until I get the car going...not sure if that is related to the plate or not but I think it is...plus I don't really notice a huge difference from the plate IMO.
Give Me TP
Member
I have a custom Diablo Predator tune and have noticed a momentary drop in idle to around 400-500 rpm when stopping, especially when the A/C is on, since downloading the tune. I am going to take the IAC plate I have installed out this weekend and see if it makes any difference. Will report back here what happens.
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