The EGR valve should have lines connected to a thermosensor on the intake manifold near the distributor or thermostat area. The second line from the pump is a vapor return line that is part of the Mikuni carb setup. Most of the threads I see with Weber carbs also limit the fuel pressure to 4 psi. Also, backfiring could be a timing related issue.
Lastly, look into the search function on 4x4wire.com and research the issue there. This is an often discussed topic with the Montero crowd, too.
The second line is the fuel feed to the accelerator enrichment pump on the Mikuni carby. You'll have to determine if the EGR valve is still functioning and has a vacuum line connected to it that is supplying vacuum. The EGR valve will stay shut until vacuum is applied to it (but these things are notorious for carboning up and most of them are non functioning...) The EGR gallery either blocks from inside the head, the gallery through the inlet manifold gets choked off or the EGR valve blocks up - or a combination of the aforementioned.
Originally Posted by rxinhed
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