i have a 1995 blazer i have had this problem since i got the truck i have to put starter fluid in the intake to get it running i have replaced the fuel pump the spider injector fuel pressure regulator and still nothing is working there is a junkyard ecm in the truck . i am racking my brain and cant think of y. also my 4 wheel drive kick on and off when it pleases no clue on that either

 

did u check ur plugs,cap and rotor or ur plug wires might be bad