Fuel filter question
My '84 CJ-7 (4.2, TR upgrade, stock carb)developed a problem over the weekend, and I'm trying to narrow it down. At idle, it began stumbling/stalling as if there was a vacuum leak or the choke was shut. Well, neither of the two were the case. I did a full tuneup, which didn't help. At a little above idle, there is a definite flat spot where the Jeep is almost stalling out at that rpm (1100 ish). I'm thinking its something with the fuel delivery, but on the highway its fine. Here's the one thing i noticed: the clear Fram filter I have just prior to the mechanical pump does not fill up at any rpm's. It stay 1/4 at all times. I took the fuel line off and cranked it, and it was pumping, but shouldn't there be more pressure (i.e. shouldn't the filter be full)? Is it something with the carburator, and what should i look for?
Also, right now it's idling much better, not perfect, but when I started it in the morning the motor could not maitain a high idle, it slowly dropped within a minute or two down to a stumble.
Any suggestions would be appreciated. I don't feel like spending this wekend at Pep Boys.