my truck won't star after intake gasket. timing problem?

My husband replaced intake gasket and when all is putting in your place . The truck won't start . I would like know if it is any sensor or any computer problem. We need help .

My husband replaced intake gasket and when all is putting in your place . The truck won't start . I would like know if it is any sensor or any computer problem. We need help .

Welcome to AF.
What year and what engine?
Was the dist put back in right?
With engine TDC and No. 1 cylinder on compressiuon stroke the rotor should be pointing to No 1 cylinder plug wire.
If a 96 or later engine with flat top dist.
Set dist as shown in this picture.
http://files.automotiveforums.com/gallery/showphoto.php?photo=51302

If dist is set right ckeck for spark and fuel pressure.
MT