The distributor being off a tooth is most likely, I think - it's hard to see whether it's aligned correctly during installation. I may pull it out and try re-aligning it.

The idle now seems to be correct at right around 900-1000, this after a good warming up, and it certainly runs much better now, so I am not going to dig much deeper. If you saw the truck, you'd agree it's just not worth the time.

Thanks for all the advice.


1988 Isuzu Trooper LS
2.8l Isuzu 4JB1-TC intercooled turbo diesel
www.dieseltrooper.blogspot.com