Engine swap

Thanks for the heads up on the motors. Saved me time and everybody knows time is everything especially when under the hood.. So here's an update on what's going on: the other motor isn't blown or locked up. It was throwing codes 1451 and 0457. So I replaced the purge valve the canister. Both solenoids. 1 is under the tank the other is under hood by the PCM. Still nothing. Very rough idle. I tried smoking it to see any leaks. No such luck. But I did replace a couple hoses that seen their better days.
Next I bought a voltmeter and checked the wires for continuity and volts. So far everything checks out fine. Still when I crank it it runs terrible. I'm out of patience and running out of options. Next step would be to check the PCM?
Also I want to add in there that the car has 155,000 roughly. It ran fine before my girlfriend wrecked it. Actually nice and roomy. I was surprised. The car however would get sluggish and run terrible as soon as it got to the second half the tank.
From the full mark down to the half way point it ran pretty dang good. If anybody has any recommendations on what else to look or check please let me know. Thanks.