Motor Ave. Auto & Truck Serive,INC. D/B/A Main Street Motors I gave them a great working car now I have a that runs very bad Farmingdale New York

I brought my 2002 Lexus ES 300 in for a check engine and inspection on 26th of January the owner  Robert calls on the 27th of January saying the car needed a head  job at a cost of $2500.00 off the top of his hand . I told Robert that I will take the car back ( I   was going to get a 2nd opinon  , he said he started taking the car a part . I asked him to put the car back together , then he told me he will try to fix the problem ,  corbon on valve from top ?. He calls me on 30th of January the car is done  $783.11. My wife and daughter picked up car  . Two day later my daughter said car is running rough and stalling .I took  the car for a ride that Saturday 7th Of Febuary the car was dangerous to drive . I brought it back Robert the owner started cursing and told me any thing he does on car I will have to pay . He held on to car for a week told me to drive car and bring it back on 18th of Febuary . I called  him on 24th of Febuary he  told me I can pick up car on 25th of Febuary and that the car needs an new engine . After getting car back the 2nd time the oil  light  goes off an on . the engine is knocking and the check engine light flickers . Before I drop off car to this shop  the car ran great