Alright, I have an 87 TII which has full emissions delete and it would start but had some sort of vacuum leak, after taking the UIM throttle body and intercooler I fixed the leak and put 720 cc injectors all the way around. I have rtek stage 2.1 upgrade and set the configuration to work with 720's. When i go to crank it, the engine turns over but won't fire.

Only way it will fire and run is if i roll start it, or spray some starter fluid in the intercooler intake and crank it.

Once its on, it runs strong, and just has a little rough idle. im just curious as to why it wont crank any other way.

 

Test the compression and vacuum. Start with the basics.