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Jeep won't stay running

538 views 2 replies 3 participants last post by  gbeltran 
#1 ·
My uncle has a 89 4.2l. It starts up cold no problem and then idles fine but when he drives it,it just cuts out like it's starving for fuel. Then it will start back up several minutes later without a problem and then do the same thing anyone have any ideas? Thanks
 
#2 ·
There is a switchover from open loop to closed loop at a water temp of (very roughly) 140F. If everything is working that transition is imperceptable.

if it messes up when it goes into closed loop, there is somtehing wrong with the computer carb control. Verify the vacuum lines and the O2 sensor
 
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