surging idle

[clang5oh]

goes from 600 to 850 roughly. could this be mass air related. a couple of weeks ago the tube after the mass air disconnected and i ran it like that for a little bit. it didnt disconnect all at once it just kinda gradually slid off. the car started to ping and i played with the timing for a couple of days till the whole tube slid off and showed me what the problem is.. it started to slide off the bottom first, thats why i didnt catch it. i also had a plug wire get a little to close to a header at the same time. that combo = really bad running car.

 

[CManT1914]

http://www.muscularmustangs.com/iac.php

The BEST writeup on fixing the dreaded idle surge.

 

[clang5oh]

i have a ford racing 65mm throttle body, it included a brand new iac. the throttle body only has about 6000 miles on it.

 

[clang5oh]

it gets that surge about 7/10 times i start it. if its not there when i start it it doesnt show up till i shut the car off and restart it.

 

[CManT1914]

i have a ford racing 65mm throttle body, it included a brand new iac. the throttle body only has about 6000 miles on it.

Did you go to pages 2-5? It also talks about the TPS, MAF, throttle body plate etc. You need to check all those items if you want to fix it. Good luck