I need to clarify. I think someone could have helped you, but we attempted to help you confirm that yours was bad. That's probably my fault, because I hate spending my money to buy a new part, only to find out I didn't need the part after all, because something else (especially something cheap) was really the problem. So I (followed by some others) offered advice on troubleshooting.
So last I saw, you were checking for vacuum leaks.
If you don't find it here, I'd suggest returning to your topic on the P'up site and update it, confirming you're still looking for the part.
Jack
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'83 Isuzu P'up Diesel LS - Original Owner
JoeIsuzu@IsuzuPup.comIsuzuPup.com