backfiring can sometimes mean a stuck valve or timing is off. Check the cam/crank timing hasn't slipped first.

On 3/31/2022 at 10:56 AM, Eazbea said:

93 Subaru legacy 2.2 cranks but won't start for a while eventually backfires cranks then starts but acts starved for fuel few minutes then drives normal can drive all day but if it sits more then few hours same thing what is this?

Things to check before buying stuff: 

- codes stored on the ECU?
- fuel pump is operating correctly 
- fuel pressure regulator is ok and not back feeding fuel into the intake
- check plugs and leads 
- check voltage at the ECU and possibly the injectors with the ignition ON - from memory the injectors are earth switched by the ECU 
- check alternator voltage output, I’m guessing this is still a round plug alt, it’s worth upgrading to the later model “square” plug unit. 
- check/replace the ignition and fuel pump relays 

Once you’ve checked and cleared these as non issues you can move forward onto looking at other things. 

Cheers 

Bennie