Lets see how well I can describe this. For about the past week I have been noticing my idle on my2000 GTisnt steady it will idle around 750 then kick up to a little over 1000 then it will try to drop below 750 and get kicked back up to normal idle and it keeps doing that. Sometimes when I am driving and comming to a stop I will push in the clutch and the idle will drop to about 500 the car will try to stall and then kick back up to normal. A few times it has actually stalled but it starts right back up. A few timesat idle at stop lights itwill start to feel like it has fouled a spark plug but when I hit the gas its fine.This has been driving me crazy sometimes it idles fine sometimes it doesnt!What do you guys think Vacuum leak?

 

This thread has tons of usefull information for you.https://mustangforums.com/m_587901/tm.htm

 

Cool! Thanks for the help. Looks like its time to hit the autoparts store.