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Your supposed to make a mark all that before you pull the distributor. Did you mark the relationship between distributor body and engine? Then you note where the rotor is pointing, make a scratch mark. When you reinstall the distributor, line up all the marks.
If engine was turned with distributor out, You need to put the #1 piston on tdc of compression stroke. Stab the distributor, which ever spark plug tower the rotor is pointing at/turning into, becomes number 1. Then you follow the firing order around the cap in clockwise direction.
Here, is what I think you are asking. The TBI intake from a 91 will fit the same size engine from 88 to 95. The Vortec didn't come out till 96 I believe. So if your 91 is the original engine then it is not a Vortec motor. If you want to swap your 5.7 with another 5.7 (5.7 = 350) Then the 88-95 should work, Just double check your sensors and locations as the plugs may be different and or in different locations. I know my 88 GMC and my 94 chevy (both K1500's) were a little different. Hope this helps.
E.C.M control injector pulsation, with key on check for voltage at injector harness, then reverse test light at battery and check for ground at the other wire at injector harness, crank engine ground should have pulsation if none bad E.C.M,good luck,hope this was very helpful.
If you pull the aircleaner off and watch the throttle body injectors they dont have anything coming out? Double check the map sensor and the throttle position sensor? Computer? I wonder if a wire to the computer has shorted out to ground.
mfi = multi port injection
tbi = throttle body injection
the way to tell is look on the intake plenum and see if there is a "carb" sitting there. That's tbi.
Intake plenum with 4 or more fuel lines going to each cylinder is a "MPI" (multiport) system....accordianman
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