jonmarois opined in
lkaboutautos.com:

> I just bought a descent 87 lx mustang. It will run only when you stick your
> hand over the air intake. It seems to suck alot more air up than it should.
> When you take you hand off it dies. I took off the fuel intake manifold and
> cleaned it up, and got a new fuel filter. The EGR valve is working too but
> it is still doing something wierd? YOu're help would be greatly
> appreciated! Thanx
>
>

Assume you are talking about a 2.3 that wont IDLE unless you block the
mouth of the throttle body

First check the PCV valve. Some aftermarkets have a bad habit of falling
apart.

If it's good disconnect and plug all access vacuum lines including brake
booster