Hey carnut. I hope you can possibly help me out here. I just bought an 87 deville with the ht4100 engine. It idles ok, a little low. E30 ICS motor rpm out of range. I'm not really bothered by that. My other problem kind of explains the error. I hear a bakfire in the throttle body and a ticking under the front valve cover. (pushrod, valve, rocker, lifter, camshaft)? Engine cranks right up and starts every time on the first try. No smoke, clean oil, no leaks. I am pulling the valve cover off to investigate. What do i need to look for and what is the easies way to check the lifters without removing the intake? Or is that even possible? I have read 1000's pf posts that turn out to be a bad camshaft but my symptoms do not sound nearly as severe as the others. Any insight you can give would be greatly appreciated.