This is a tough one. Based on your description, it sounds like you have a collapsed lifter. If that happens, #5 won't run if the valves aren't opening. As far as the injectors, if they are dumping too much fuel, check fuel pressure and regulator to make sure they are working and within spec.

Answered by Jacobandnickolas (expert)
57,475 answers provided

ok today i took off thee the intake to expose the all the lifters (they are roller lifters) and found out that as i turned the crank by hand that the #5 exhaust lifter made a clicking or taping noise but it seemed to move freely only thing is it made the clicking noise so could this mean i have a worn bearing on that particular cylinder and for the injectors i noticed that number 5 and 7 cyl were glued at the top cuz the clips that were holding them down were missing.....Thanks

Response from chev_man00
9 questions asked

Check closely at the rocker towers to make sure nothing is cracked. If you hear a clicking, something is sticking or broken.

Answered by Jacobandnickolas (expert)
57,475 answers provided