1991 Subaru Liberty 4 cyl Two Wheel Drive Automatic
i bought myself a 91 subaru liberty.
with the non turbo 2.2L ej22 engine.
has had the heads rebuilt.
put back one and adjusted all the timing as per service manual.
ignition leads were removed to turn over engine without starting to get oil throughout engine and pressure.
no noise occurred.
when leads are attached and engine starts.
the idle is advanced but slowly comes back.
a metallic noise like the tappets occurs.
what could be the probable cause and how could I rectify this problem.