87 wrangler 4.2

[smalloy24]

i have a 87 wrangler with 4.2 just bought new stock carb because i had a miss when at idle and when about 2500 did not fix problem,replaced coil,wires,carb,cap,rotor,plugs same thing it runs smooth but every 10 s or so it kinda stumbles and when giving it gas it gets more aggressive




any ideals thanks

 

[superj]

No vacuum leaks?

 

[smalloy24]

I couldent find any

 

[sjlane]

Stock carb as in a Carter Carb? If so, switch out to Motorcraft 2100.

 

[smalloy24]

yes with carter is that were the little miss is its new thought it would be good new

 

[sjlane]

If you read through the forums the Carter Carbs are not the best at best. I am in the process of putting the Motorcraft 2100/2150 on my 4.2. My Carter Carb was a constant messing with it. And, I had it rebuilt less than 2 years ago.

When you read the forums, folks have used the Motorcraft 2100/2150, Webers, and Holleys. And everyone has an opinion on which Carb to switch too. The Motorcraft is rather inexpensive switch out.

Just my humble opinion.

 

[degolyerent]

How many miles?

 

[superj]

my next carb will be the motorcraft carb. i have the weber and its ok

 

[smalloy24]

Less than 76000 miles

 

[degolyerent]

Try to check the compression to make sure that one cylinder is not a lot lower than others

 

[superj]

note on that: the cylinders are supposed to be within 10% of each other, if i remember right. one that is a ways out is bad but one that is (say) 120 while the others are 130 is acceptable because it is in the 10% limit