most likely the comp. is bad not letting the injectors work
The larger the engine and the more cylinders it has the more fuel is "injected" into the cylinders ising more fuel
no the vortec is computerize and that runs the fuel pump At a greater pressure than be atained by a mechanicle fuel pump.
vortec trucks have MPI Multipoint fuel injection. yes it's not getting enough electic to the wires to fuel pump
your not burning all the fuel in one or more of your cylinders. Check your spark plugs and fuel injectors.
The fuel in the cylinders exploding
The fuel in the cylinders exploding
It would be nice to know the years of the 2 engines to tell you the fuel pressure for sure. But I do KNOW that the Vortec engine requires alot more fuel pressure to run the engine then your other engine requires.
under the intake manifold mounted to the CFI (central fuel injector)
The 88 engine is a TBI / Throttle Body injection engine. I don't know the month of 1996 when they changed to the vortec engine fuel system, But I believe it was in late 1996. You should know if the 1996 engine is a TBI engine or a vortec engine if you have Sean it. So if it is a TBI engine then you have no problems, Put it in there and hook everything up and your good to go. Now if it's a vortec engine you have problems, None of the wireing will hook up to the 88 engine sensors. And the 96 computer will not run the 88 engine. And the fuel pump in the 96 Tahoe has to much fuel pressure for a TBI engine. You can not put the vortec fuel system/ intake manifold on the 88 engine because none of the intake bolts will match the heads or vise verse. You will be opening a can of worms. You need to go back with a vortec engine if that is whats in the Tahoe now.
You need three things for the engine to run, compression, fuel and spark. You say you have fuel now check for spark.
Because it is burning fuel in its cylinders.
you would need to change the cylinder heads also.See link below