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36 Posts
Discussion Starter #1
1994 F150 5.0L
I beleive I have a vacuum leak coming from the fuel pressure regulator area. I can hear a hissing sound coming from the fuel pressure regulator area. I have tried spraying starter fluid in the area of the hiss, but can't really tell if it is effecting the idle. It starts up first time every time but has a rough idle. I have recently replaced the plug wires, plugs and mass air flow sensor.
Before I replace the regulator, does anyone have any other suggestions?
 

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Hi-Tech *******
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1,486 Posts
You gotta find that leak to smooth it out. I use Dragon Fire to spray around the area to find vacuum leak because it works better that starting fluid.

Could be an intake gasket.
 
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