Try replacing your injector o-rings!
I replaced my intake manifold gasket recently (for another issue - exhaust was cracked) and when I took the old injectors out I found that there was a bunch of carbon and grease where they seat into the intake manifold. Once I cleaned that out, they didn't seal worth shit anymore. My idle was around 1000-1100.
I just replaced them with yellow Ford 19 pounders with new seal kits, and my idle is perfect now.
So if you've chased everything down and still can't find your vacuum leak, check your injector o-rings!
This tip brought to you by beer. mmm beer.
I replaced my intake manifold gasket recently (for another issue - exhaust was cracked) and when I took the old injectors out I found that there was a bunch of carbon and grease where they seat into the intake manifold. Once I cleaned that out, they didn't seal worth shit anymore. My idle was around 1000-1100.
I just replaced them with yellow Ford 19 pounders with new seal kits, and my idle is perfect now.
So if you've chased everything down and still can't find your vacuum leak, check your injector o-rings!
This tip brought to you by beer. mmm beer.