Motor Surging

[big steve33]

I need help from the mustang gurus. I have a 92 5.0 in a 67 cougar. The motor surges at an idle when its cold once warm it idles high with a slight surge. It has great power up to about 2000-2500 rps but after that it sounds like its popping back through the intake. Any ideas?

 

[95Vert383AOD]

Is it computer controlled? If so does it have Mass air?

 

[big steve33]

yes it is computer controlled and it does have a mass air flow meter. I did pull the top of the intake off to polish it could it be a vacuum leak?

 

[jrichker]

See the "Surging Idle Checklist” for help with all your idle/stall problems. You can guess at the problem and throw parts at it, or you can use the checklist to help you find the problem quickly and inexpensively. The checklist is right here in the Stangnet 5.0 Tech forum and you don’t have navigate to some other unknown web site. It‘s free and doesn’t cost anything: at last count there were more than 103,000 visits and still climbing

The quick and easy way to dump the codes is in there too, and all you need to do it is a paper clip! The first two posts contain all the fixes & updates. At last count there were 24 possible causes and fixes for surging idle/stall problems. I continue to update it as more people post fixes or ask questions.