I had the same EXACT problems with the same codes comming up. It was the intake manifold gasket. You will have to replace both sides. If you are good with a wrench you can probably do it yourself, but i'm sure that is what it is. When i had that problem we tried and tried to narrow it down by detecting a leak, but it never worked. Lukally a friend of mine is a mechanic and he garonteed me that is what it was. he was right, when we got done replaceing them the truck ran like new.

My bet is on the intake manifold gaskets.

trav

1998 Isuzu Rodeo -- slightly modified.