My 99 LHS tends to not want to start after you shut it off. (usually when warmed up). I have checked the coils and plugs. They seemed to check out ok. The next time it acted up, it wouldnt start at all. I thought maybe fuel this time. So I had my wife crank it while using starting fluid. It started and began to run rough. This leads me to believe its a fuel issue. (By the way, everything runs fine when I do get it started). Also it is not showing any engine codes.

 

I still have no clue whats wrong with this car. And I have no clue where to get started from here... any insight would be greatly appreciated.

 

Not sure if this is the problem but I had a similar problem a few months ago with my LHS. I was driving it, haven't had any major problems at all with it. I went to the store, came back out and the car wouldn't start. Engine wouldn't turn, all I could hear was a faint clicking. After it had set for a while it would start half the time. The battery was fine, wasn't anything wrong with the starter so when I had it towed to the dealership it started up no problem. Drove it home and it started doing the same thing. I got it to start later and drove it up and they determined that my LoJack was messed up and my car thought I was trying to steal it... lol.. so they rewired it and everything worked fine. Cost 200 bucks to fix.