I just finished putting the new tbi on my 91 chevy silverado 1500 5.7 v8 350 and now it won't start. It turns over like it's wanting to start. It's been sitting waiting for a new tbi for about 3 wks and finally got the new one in a few days ago. Not sure what next. Sensors are all OK, no fuel leaking from anywhere that I've found. Please help.