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Hey everyone! I have a 68 cougar with a 302 automatic! It has a rough idle and pinging coming from the tail pipes! So the search is on for a vacuum leak! I may be suspecting the carb gasket! So what can i spray on and around a potential leak thats safe to use?
 

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I always use starting fluid or carb cleaner.
 

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Yep - cheap and easy. Also propane works quite well if you have a torch handy....just crack open the valve a bit and run it around the rubber hoses carb base, headlight switch, brake booster, etc. It's safe and you will hear the engine stumble if it sucks any in. A little peice of rubber hose over the end makes it easier to flex into tight spots....
 

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Never thought of the propane. I like that. no mess to clean up and won't hurt the paint either!
 

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Also check the rubber elbow that connects the vacuum line to the modulator on the transmission. That's a common spot for vacuum leaks.
 

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You can also isolate individual system, but blocking off items. I.E., the power brake booster, the headlight vacuum, at the back of the engine may help determine if it a leak on the engine, or from some where else..
 

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I unplugged everything to my vacuum tree and plugged the tree with caps. then sprayed all over the engine especially under the car and intake meets block.....it wont make a mess cause the carb cleaner etc. evaporates. but it will revv up if its a leak.....
 
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