Q: Just replaced intake gasket, rotor and cap. Now runs rough and have code 0108. on 1996 Chevrolet S10

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Truck starts hard, idles rough, has no power and brake pedal is stiff. ????
(2) Answers
PLUG your brake booster vacuum hose back to the correct port . With a vacuum leak that large you should be able to hear it.Just a thought , call me an idiot if you don't have a vacuum leak related to the brake booster hose.
P0108=Map/Baro sensor high input
I would check to see if there are any vacuum leaks and the order of the spark plug wires.
This code can also be brought on when there is a short in the wiring to the sensor as well as a vacuum leak
Good luck