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Hello, I have a 1987 YJ 2.5L. It has a bad miss at idle once warmed up. It has a new fuel pump, MAP, Coolant sensor and the mechanic put a used fuel pressure regulator in it. Today, I hooked up my old Snap-on scanner. It shows that it is staying in open loop, it has 0 hg. of manifold vacuum, and coolant is not going over 155 degrees. I changed the coolant sensor and it reads exactly the same. Any thoughts would be greatly appreciated. Tony