Ok so I am having the same trouble than like 99 % of yj owners have or have had. It wont idle, runs awesome other than that but at stop signs and redlights she dies. I have done some research myself but am looking for some other opinions. I have the Carter BBD carb on it now and all the research I have done has pointed me toward the upgrade. I have found that the Weber is a quality carb and it is a pretty good price. So any feedback is welcome and would be appreciated.
It's better to die on your feet than to live your life on you knees!
over christmas break i installed a Holley 2300 truck avenger 2 barrel carby, using mr. gasket #1937 adapter. couldn't be happier she comes off the line like a champ and will idle all day long if i let her. fuel mileage has also gone up to 18-19mpg over the 14mpg the carter was giving me. (31s on 3.07 gears)
i looked at the mc2100 first, but to buy it prof rebuilt was around $220, and the brand new holley (which has loads of aftermarket support) was $275 at JEGS. just my 2 cents
TeamRush, Nuttered, Holley 2300, heavy right foot, 2.5 Rancho lift, 2400watts of subs, xenon headlights, fogs
-"A fella can't know too much" Freshman@OSU
Ditto on the Motorcraft 2100. Best mod I've made to date on my 4.2L. EZ install too. Search E-bay Motors for "Jeep 2100" and you'll find the guy in Colorado Springs. Included great documentation and answered all my questions.
'90 YJ, 4.2 L, Nutter Bypass, DuraSpark Upgrade, MC2100, no more emissions junk, K&N air filter, AX15, 4" Leaf Lift, 33" Tires, 7" Flares