Intake manifold

I have a 1989 Jeep Cherokee 4.0 std. transmission, with 4x4. The
engine was crap so I pulled it out, in its place I put a 1992 Jeep
4.0. I personally did not hook all the components up like electric,
intake, exhaust. So a shop put the 1989 air intake manifold on the
1992 jeep engine and hooked up the wiring. Well now the 1989 intake
manifold on the 1992 engine sounds like it is leaking. I thought it
might be the muffler but I think that would be more of a ticking sound
or I would see movements on the tachometer at idle like the idle going
up and then back down. But I do not, so when I pull the accelerator
cable I hear an extra suction sound on the back of the intake manifold
close to the firewall on the driver side. I was wondering if I could
just put my 1992 intake manifold on and change the throttle body for
it to work, maybe change some other things as well. Or is that not
possible and I have to take the intake manifold off and fix it some
how??? Oh I think the fuel injection system is a little bit different
from the 89 to 92 years so could that also not allow me to put the
1992 air intake manifold in the 1989 jeep b/c the electrical
connections are different. Thanks

Your 1989 engine and attachments like the intake manifold are non-HO. The engine you put in is an HO engine. The HO head has slightly different intake port size and position compared to the non-HO head, which is why it breathes better. I'm sure you would get a better fit for the intake manaifold with the matching (HO) intake on the HO head. The issue turns into mounting the non-HO throttle body (by using an adapter plate) or adapting the non-HO TPS (which your computer needs) to work on the HO throttle body. Some more information is available here: http://www.off-road.com/jeep/cherokee/99/09_sept/engswap/engswap.html

thanks

appreciate the info.....