I got the new cam and lifters installed and even got the beast running (89 XJ, 4.0) and it runs smoother and has more pep ... so far but I haven't driven farther than around the block.
I won't be taking any longer drives without a recovery vehicle handy.
I have to dig under the dash and into the connections on the vacuum reserve tank behind the bumper to try to find the cause of the fluctuating idle.
I suspect the problem is under the dash as I've not been able to switch from defroster flow to floor flow for two winters now.
Unfortunately, there isn't a diagram of the heater vacuum circuits available online for the 89 XJ that I've been able to find.
I also don't like the look of the vacuum line for the heater water control valve (I also converted from a closed cooling system to an open system while the beast was apart).
Budd