Late to reply here, but I've been dealing with a few issues that seem to be figured out for the most part. I'm not a car guy (learning myself some) but here it goes...
I had someone put in an all new carb and distributor. The emissions tests came back way, way better, but the pressure is still failing. I had someone replace some of the tubes, but took the Jeep back this morning and its still failing.
Also, when the guy put in the new carb, he put in a new air intake filter. The tube it attached to melted straight off and he said it was because of the exhaust, and that I could take it to an exhaust shop... he said something about getting more horsepower and better fuel efficiency when I did that...
I'm in over my head here so any help is greatly appreciated. !!!