5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Idle Problem 1990 Foxbody GT

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Old 12-01-2015, 06:30 PM
  #1  
Blanket
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Default Idle Problem 1990 Foxbody GT

I went to school yesterday and my car drove just fine but then i came home and i started to leave again and i was sitting at the stop sign and it started idling real rough. So i revved it hoping it wouldn't stall but it felt like no power hardly. So i rolled back into a neighbors driveway and waited for a minute. It started just fine so i pulled out then the same thing happened. I turned around after starting it again made it halfway down my neighborhood while driving it started real rough again. I stopped waited a minute then started it to bring it home it ran fine then as soon as i got to the driveway it happened again. I don't know what this is i cleaned the IAC a couple months ago and i haven't had this problem. Is it the fuel system or maybe a bad sensor if so how do i tell. Thanks!
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Old 12-02-2015, 09:11 AM
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88 orangepeel notch
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I'd pull codes to see what's stored. Then start looking for a vacuum leak. Give all lines a good once over looking for cracked, melted, or just broken ones. Nothing screws with the EFI more than a vacuum leak. Plus its very common, good luck.

Welcome to the forum by the way.
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