ruff idle

[noslow5ohh]

my car has a eradic idol goes high then low like it wants to stall then high again i changed the idol control actuator could it be the idol sensor?

[Scut95]

By idol control actuator im guessing you mean the IAC valve (idle air control)? if not try cleaning that and the mass airflow sensor and see if that helps.

[SimplyOrange]

clean the iac valve then randomly spray carb cleaner to check for a vacume leak, itll idle up if it has a leak.

[silverstangboy]

does this car have a chip as well?

[noslow5ohh]

i know it has a aftermarket ma air meter and the components to run the boost and timing i dont know about a chip

[79Bronco5L]

I too, had this problem when I swapped my 5.0 into my 79 Bronco. I had to reset the base idle, then adjust the tps. I got the instructions for this at muscularmustangs.com, and its been fine ever since.

[wvstang5.0ho]

Quote: Originally Posted by SimplyOrangeTPS clean the iac valve then randomly spray carb cleaner to check for a vacume leak, itll idle up if it has a leak.

Ok noob ? where is this iac located Im having the same issues. Also it stays at high rpm's in between shifts, I let off the throttle to shift and it stays where it last was.

[Scut95]

The IAC is located on the throttle Body.....there's 2 bolts that hold it in, an electrical connection and there is a gasket on the other side so try not to lose it. Most Mustang's RPM's hang up a bit when shifting....does it hang for a second and then drop or does it just stay there no matter what?

[wvstang5.0ho]

Quote: Originally Posted by Scut95 The IAC is located on the throttle Body.....there's 2 bolts that hold it in, an electrical connection and there is a gasket on the other side so try not to lose it. Most Mustang's RPM's hang up a bit when shifting....does it hang for a second and then drop or does it just stay there no matter what?

Ok great thanks for the info, yes just hangs there a few seconds, first Mustang so Im new to how they run and react. So thanks alot, any suggestions on how I go about cleaning it and the TB. thanks for the help.

[Herbstang]

Quote: Originally Posted by Scut95 The IAC is located on the throttle Body.....there's 2 bolts that hold it in, an electrical connection and there is a gasket on the other side so try not to lose it. Most Mustang's RPM's hang up a bit when shifting....does it hang for a second and then drop or does it just stay there no matter what?

The RPM highing can be corrected with a tuner .you need to adjust the RPM decay rate ford set it up this way to burn off excess fuel

[wvstang5.0ho]

Quote: Originally Posted by Herbstang The RPM highing can be corrected with a tuner .you need to adjust the RPM decay rate ford set it up this way to burn off excess fuel

Great thanks, I was looking into getting one, what is a good one to get for a 94 GT ?

[Scut95]

Quote: Ok great thanks for the info, yes just hangs there a few seconds, first Mustang so Im new to how they run and react. So thanks alot, any suggestions on how I go about cleaning it and the TB. thanks for the help.

Take the motor off and spray in brake or carb cleaner....basically you can only spray in, so just try and get everywhere in there and then let it dry out a bit.....the throttle body, spray with TB cleaner or brake cleaner and you can use a tooth brush to scrub the carbon and dirt out. Thats what we so at work atleast