I have a 1992 s10 blazer 4 door 4.3L with the vin W cpi injection. i recently replaced the fuel injector unit be cause the old one blew a seal in the regulator pouring gas inside the manifold. so i replaced that and the gaskets. and now it is not starting. i went through three sets of plugs trying to get it to start. and killed a battery. prior to replacing injector it sat for like 5 months. within the last year i have replaced every single sensor the distributor the coil plug wires radiator exhaust ignition key lock battery and other things that wouldnt effect the no start. oh i guess timing chain and gears. when it was doing its not starting it would crank like normal and now it just makes a loud ass spinning noise but would pop out and engage ive taken the starter out twice and cleaned it greased it with silicon lube and it still is doing this. every like 25 key turns it will actually crank then get like jammed or something. im thinking its the ecu maybe or neutral switch. i replaced the ecu two years ago. i tried to check the stored codes yesterday and when you jump the pins on the plug under steering wheel nothing happens so when i check the abs it flashes like normal try ecu again nothing. which is making me think the ecu is not getting signals out or receiving signals or just not getting power. the battery terminals are all new. all the ecu plugs are tight. the starter works fine when you bench test it just not in the motor and the flywheel teeth are fine. really dont want to bring it in and cant afford it but i dont have diagnostic tools just my tool set i got for technician school. someone please give me any help you can.