loss of power and acceleration when driving / like there is no gas entering engine on 1990 Mazda B2200

My name is Frank / my Mazda 90 Pick up truck has a loss of
power while driving (* have changed spark plugs and did a
cylinder test 120 psi on each )
Need help: engine light came on and it is hard to start- because it dies or shuts off.

Asked by for the 1990 Mazda B2200
If the check engine light is on, clues as to the cause of your problem are present. You really need to have a proper diagnosis performed on this vehicle, especially with its age and primitive (by today's standards) processor capabilities. Can be air flow or barometric pressure related, could be a vacuum leak, could be several things...