Im not to familar with the 2.8 v6, I know the basics, If your getting fuel, air, and Spark, in thoery, It should run. BUT with todays engines.... who knows and Obviously your not getting fuel like you are saying, and your on the right track. Anymore, you have to push buttons and slide this deal over then turn the steering wheel this way and hang your arm out the window just to see the odometer. Im glad I dont work In a DealerShip.... I hope you find your Problem.

89'Isuzu Trooper LS 5 spd 2.6L
31" Big O X/T's
15x8 Eagle 058's
K&N Filter w/ Air Box Mod
2.25" DynoMax SuperTurbo
PolyUrathane/Indy4X Bushings
Suspension/ FrontEnd Tech/Hunter Certified Alignment Tech.