upgrade my ecm
 

I have my 87 jeep comanche 4.0 and I BEEN hearing about a ecm upgrade to a 88 or 90 what I need is what model numbers should I be looking for I also would like to do an injector upgrade again I don't know what to look for my truck is a 5 speed it's getting very hard to find parts at my neighborhood junk yard so I have to do so on eBay thanks for any I can get with these