67Ranger

iTrader: (16)

I just noticed this problem on a long road trip. When the a/c is on and the engine is at a constant speed, it comes from the dash vents. Whenever I accelerate, or increase the engine load, it switches to the floor vents. I'm assuming that this is a vacuum leak somewhere. There are a few coming from the back of the intake, and those split off into even more lines, so mostly I was wondering which line to check, and how to do that.

OnA Fan

iTrader: (6)

I had the same issue, look in here

https://ls1tech.com/forums/showthrea...light=diaphram

67Ranger

iTrader: (16)

thanks man, i appreciate it. I'll try replacing that thing.