Manifold gasket????

When I changed by intakes on my last 5.0 I just used lots of RTV also. I never had a problem. I don't think that would be your problem. however, I'm no certified mechanic either.

If you were leaking vacume from the rear of the intake or where you used the rtv, you would also be leaking oil. Assuming you are talking about one of the end gaskets. Did you correctly adjust your base idle and tps?

This was a reply to your earlier post. You have to have a volt meter to adjust the tps to the proper setting. The throttle blade has to be set for the base idle first. With the engine warm disconnect the harness to the iac motor. If the base idle is set correctly it should idle @ approx. 700rpm's. If not, adjust the idle screw on the t/b to the correct rpm. Now with the engine still running, connect a volt meter. Black to groung and red to the tps signal wire. Maybe green depending on year. The other 2 wires are ground and your 5 volt reference. rotate the tps until you acheive .95 -.99 of a volt and tighten down the screws. Now plug in the iac motor and if that's functioning properly the car should idle normally. Hope this helps. You must adjust the base idle first before the tps adjustment!!!

well i am a certified mechanic

There is no engine vacuum where the lower intake meets the block. Below that is the lifter valley. If there was a bad seal there, it would leak oil. Check your TPS and listen closely around the engine for a "hissing" sound.

gxnos said:

There is no engine vacuum where the lower intake meets the block. Below that is the lifter valley. If there was a bad seal there, it would leak oil. Check your TPS and listen closely around the engine for a "hissing" sound.

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Ahhh Tushay