91 YJ stalling

[sammon287]

1040128

I have had an intermittent problem with stalling since I got my YJ over a year ago. When the engine is warm and I'm cruising along, the engine cuts out abruptly, then restarts. It may do that a couple times in several minutes, then the problem disappears for several months. Up until yesterday it wasn't that big of a problem. I had to pull over when it wouldn't stay running. It would restart, but as soon as I touched the gas pedal, it stalled. After letting it cool down for a few minutes, It got me home, bucking once within sight of my driveway. I don't think it's bad gas or the whole tank would cause problems. It runs perfectly otherwise. I would think dirty injectors would cause consistently poor running and rough idle too. Replaced within the last 5000 miles: fuel pump, fuel filter, coil, plugs (brand new + old ones were clean), air filter, cleaned throttle body. It does not show a check engine light, making me think it's not TPS, MAP, or O2 sensor. It has 127,000 miles indicated, but with larger tires most of its life, I guesstimate about 140k actual. Would the PCM be affected by heat? Acts like vapor lock on a carburetor. Any suggestions appreciated.
[addsig]

 

[bob]

1040168

i'm guessing something electrical is about to go bad. hasen't broken yet, but sounds like it's about to. maybe a wire shorting out, or just a bad electrical connection. i had a problem and found out it was a poor solder connection in the wire harness. the dealer might have a gaget to hook to your computer. so while you drive it records what happens.
[addsig]

 

[firemedic19077]

1040173

I had same problem it was having the same problem and spent the money to have a test on it. Resulted in O2 sensor, changed and ran like a charm. undefined
[addsig]

 

[hi_c]

1040890

I know this is 3 months late, but I just took my Jeep into the dealership for a checkup and they said that there was a recall on my 89YJ for the O2 sensor. Might want to get that checked out. [addsig]

 

[Quik8slvr]

1040894

check you're cat converter, i had a similar problem, bucking and starting but then stalling when giving gas, and my cat had become so bad that it broke into small pieces and would occasionaly get lodged in the exhaust pipe and it would run rough or not at all untill the pice broke up small enough, 30 minutes, a big screw driver, and a Hammer later i had a hollowed out cat, and its run like a charm ever since[addsig]