Mc2150 tuning on 4.2 - Jeep Garage - Jeep Forum

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Old 02-22-2016, 04:32 AM
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Mc2150 tuning on 4.2

Hey guys, I have a 89 Yj.
The engine is a fresh rebuilt 4.2 Pistons .030 over.
Installed a 4.0 #0630 head, HO intake and race header with MC 2150 1.08v carb.
I freshly rebuilt the carb with rebuild kit #15593D(walker)
Adjusted timing to 9.0btdc with vacuum line unplugged etc.
I have the idle screws 3 turns out and the engine runs and idles smooth, even revs up great

-my problem is on moderate or hard acceleration the motor will studder and run rough, if let off it will level back out the idle.
-I've tried many adjustments, timing, carb adjustments etc and I am wondering if the kit I bought for the rebuild has the incorrect power valve, I think it is a 8" from what I've found online.
-the carb came off of a amc v8.
-any ideas would be great!

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