Let me start witha little back story. I have been looking through the forum for a few days now trying to find someone who has had the same problem but have had no luck.
I bought my 84 Jeep CJ7 with a few problems with the intent of fixing them all.
My valve cover was the stock plastic one which leaked oil like crazy - replaced it with a cast aluminum one.
My water pump went out on the drive home after purchase - replaced it.
The stock carter carb ran OK at best - so i replaced it with a 1.08 Motorcraft 2100 that I got from ebay. I did a rebuild and made the custom brackets for the throttle linkage.
I started it up with the vac gauge attached and everything looked great. Ran smooth and it measured at about 19. Throttle response was great and all the power was there. Ran it down the street with no issues. Thought it was done and perfect.
BUT THEN i reved it up to maybe 2500 and heard a pop from under the engine compartment. The engine started to run roughly and the vac gauge was bouncing back and forth. I tried to see if there was anything obvious under the hood but nothing stood out. THEN after a minute or two the engine calmed down and got smooth. The vac reading went back to normal. I tried driving it around a little bit but under load the engine seemed to want to cut out. I had to feather the clutch and give it lots of gas.
I checked under the valve cover for a bad spring but again nothing stood out. Everything seemed OK.
So im stuck. Has anyone ever run in to anything like this before?
Thanks for the help!