1994 Toyota 4Runner Rough Idle and Poor Workmanship

I recently blew a head gasket. When I got it back it ran horrible at idle, surging from 1000rpm to 2500rpm. The mechanic said the O2 sensors were soaked from antifreeze and sending bad signals. He told me to drive it and it would dry out. A few days later still runnung bad and starts to sound like its lost oil. When I checked the oil I found out the dipstick hadnt been reattached leaving a large hole in oil pan. Looking furhter I found they had replaced a fuel hose with wrong hose and it had kinked, didnt secure a electrical bracket, and had a wire laying across my drivebelt. Took it back, they fixed those issues. Next day started getting a backfire as well as rough idle. Took it back, after 4 days guy said he still thought it was O2 sensors but no codes. Had a mechanic friend look at it today. We found one obvious vacuum line split, another on in the back of the engine not attached, and he found that the intake manifold was sucking air all the way around( used throttle body cleaner) Is this something I should expect the original mechanic to deal with this now? $1800 dollars later id expect a professional job to be done.