Typical sign of the air leak at the point where the hard line from the master mates at the inlet if the internal slave. The line goes in with two o-rings and a clip holds it in place. Somehow it gets moved just a little and will not hold the seal when everything heats up. My solution was the external mod.
How do you fix your problem??? Pull it all apart and try again its a real PIA.
89 2.5 TBI, 4" RC lift, 1" Booms, SYE, Adams Driveshafts front and rear, Ford 8.8 with 4:88s, BFG 33X12.50X15, and a ton of other stuff.
AF Jeep Club Tail Number 184