New engine or rebuild in Dallas

Bought a 2004 w/128K mi. for my daughter last Summer. No idea if engine has been replaced. All along has been sometimes difficult to start when warm. Now idles rough and sometimes stalls. Dealer says back rotor compression is eight point something whatever-units, but front is five point something while normal should be 6.8 and that I need a new engine. They don't rebuild them and wants $6K for new installed. Is there anybody in/around Dallas that can rebuild existing or install new engine for much less than $6K?



Other advice?



Thanks

SL