I have a 88 suburban 350 tbi, thats been sitting for a few years. I need a shop truck so I am trying to get her going. Has spark new cables, battery charged. Got it to start today with starting fluid but it will not stay running. What can I do to check the fuel pump and how do I drain the old gas out of the tank(do I have to drop it?). Thanks, I trust the guys on J.J and always here good things about you guys here!