I beg to differ Michael, on a couple of points. First, the Holley and stock injectors ARE NOT interchangeable. Second, people ran Holleys on 2.8s successfully before we (I) put the first 3.4 in a Trooper.

However, I sort of remember you saying that your Holley came with no directions, so you just matched wiring colors. If you, that is your problem. The Isuzu and Chevys use different wiring color standards.

There is a very old article that was done by Sean Michael when he put the first Holley on a 2.8. I just checked and the article is still on the net.

The article is at

LINK

You will probably have to cut and paste that URL. The article contains the correct wiring connections to run the Holley with the Isuzu wiring.

Good luck.