Cornbread01

This doesnot happen all the time only happended twice so far.... after driving on the freeway for say about 18miles at no more than75mph when i get on the on ramp and put her in nuetral and press on the brakes to slow down the car will go down to about 100-200 rpms and almost stall and will jump up to the normal 6k and then back down to 1-2 k(this will happen twice or so) then will go to normal... the first time this happened the car just stalled.... i started noticing it after i did my manifold swap to the one with a aluminum cross over. checked for leaks cant find nor here any and other than that the car drive fine.
Thanks

jpmustanggt

Sounds about right to me. easy fix

GhostRider02GT

goes up to the normal 6K? or do you mean 600?

Cornbread01

yea 600 lol i hope 6 k is not a norm ideal lol sorry bout that and the 1-2 k should be 100-200 rpm(I had a migrane yesterday)

GhostRider02GT

yea, IAC might be the culprit

Cornbread01

thats what i thought and hoped sences it is easy and cheap thanks for the response. (btw it still is the orginal iac about 93,000 miles)

Nitti00GT

Just take it off and clean it with throttle body cleaner. Worked for my buddy.

lewistk

same thing just happened to my 96gt. i swapped out the iac valve and checked for vacuum leaks and it stayed the same.... ive heard my problemcould be abad fuel pump which i intend to do this week, so this could be your problem too?

Cornbread01

brand new svt fuel pump less than 5k on it

uberstang1

looking at ur pics looks like u have a s/c , i had the same problems with mine, i had to turn my idle up to about 1100 to avoid stalling issues, not really sure whats up either.