I just bout a property from and elderly couple. that came with a 2016 Sting Ray Boat. it had sit for 3 years without being started . was put in the garage from the day they bought it . We took it to the dealer to be checked out . They advised to pump out the 3/4 tank of gas. and use the break oin since the volvo 200hp inboard only had 1.7 hrs on it we put in in the water last weekend after refueling . It was running rough and spitting and sputtering within minutes after starting . ther was a wierd squeal and surge then wouldnt restart . Any Help ? What could wrong ?