alright, so basically i pulled my engine and replaced it for stupid reasons. i got it running drove it around for two hours running perfectly fine, everything was great and it started running like total ***. it will barley hold idle and dies alot, there no power either. looked, i had no vacume leaks, i was getting spark, the air flow meter was hooked and working and i replaced my spark plugs and still no luck, any ideas?

also having start up issues and it constantly seems to be the same thing. my batteryu and my starter, i already got the alternator checked and it was fine. the battery keeps going dead and the alternator too, any idea what keeps killing them?

 

Do a compression test...