1990 tracker not starting

[fixkick]

I've read about everything I can pertaining to my problem. Was running fine then on way to work a couple of weeks ago she cut off on me on the road. I had it towed back to the house. I figured fuel pump. But fuel pump is fine good pressure. So I jumped the gun and shelled out big bucks for an injecter 8 valve throttle body. No luck. I let it sit for about a week and low and behold it started up fine. Drove for 2 days then did the same thing. Checked injecter ohmed out fine but no spray. Checked plug to injecter with noid light did not light up or pulse. Pulled computer opened her up capacitors are fine circuit board is fine. Spark is good. Just wanting some input on which way to go next. Could it be throttle position sensor stopping the computer from sending signal? Or possibly noise suppresser. I went out today and it cranked again but had to pat gas for about 5 minutes Then idled at 3000 to five thousand rpms in park or neutral put in gear would idle at 1000 to 1500 rpms. Drove it around parked it and in park idled at 3000 rpms. Cut it off and back to the same ol same not cranking. No codes on cel only flashes 12. Any help would be appreciated. 
Thanks
Mark walser.

not cranking, Im sure you meant cranks great but will not start. (cranking failure is a whole other problem , totally)

first off, , if the ECU sees spark dead via  the suppressor path it cuts fuel by law, and to not start a huge fire. (fire safety , all EFI cars do that)

so when it will not inject check spark at all 4 cylinders and even 4 spark plug tips not carbon fouled, or oil or antifreeze fouled.
if spark timing is way off cam belt failure.
if the TPS ground wire is cut the that puts throttle angle at WOT 4 to 5vdc, and ecu sees that as WOT as driver requested cranking and unflood mode and cuts fuel.

if spark was good then why not use test fuel,  if engine is ok and spark is good all gas engine run on test fuel (can of starting fluid spray) all do and is super easy tests.  if that works check TPS voltage on center angle pin. for 1vdc cranked, not 4, not 5v, but 1v,  if at 1volt the TPS is working, 1vdc is idle angle voltage.

is the front crank pulley bolt 17mm hex head at 94ft/lbs and not loose as a goose.
is the cam belt not shredded or slipping and jumping about.?????

but fuel cuts only for 3 reasons.
1: spark dead
2: or CMP dead. causes spark dead or code 41, or 42 error, 5 seconds cranked jumper in place. DLC,
3: WOT, TPS  sending 4v or more as throttle angel.  

sure bad ECU too but needs proofs simple.

Try test fuel.  any engine with good spark this simple tests proves,  spark and engine are good.