How do you find a vacuum leak for a 94 gmc 2500? My truck possibly might have one, it whistles and almost stalls at red lights. Idals around 300 rmp.

Asked by Jun 13, 2014 at 10:04 PM

Question type: Maintenance & Repair

Engine. 5.7l v8 350

1 Answer


You will have to look and listen for it. Can also carefully spray some injector cleaner around the hoses and listen for a change in the engine sound. When the sound changes from the spray you are getting close to the leak.

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