1995 GMC Jimmy starts sometimes

hello, my question is ,my jimmy has had a new computer put in plus tps,map,iac valve fuel pump sparkplugs, cap rotor and sparkplug wires. well after all that the problem is it starts and runs fine but i turn it off and it wont start it just cranks and sometimes it doesnt even crank but like the next day it will start
what can it be help. p.s. i also replaced the coil .