[Jlynn]

Key turns in ignition fine but engine won't turn over. New battey 3 months ago. Battery cables seem fine. Sometimes lights flicker when I try to start it. Any suggestions?

 

[JuneBug]

How many miles do you have on it? Does it click when you turn the key? Have you tried shifting to Neutral and then turning the key? Could be a bad starter.

 

[Dr. Dyno]

Do you get any clicking when you turn the key?

BTW, JuneBug will probably move this to the 4.3 Mechanical thread so look for continuation there.