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I recently bought a 87 yj 4.2 only to have a valve spring break and bend the pushrods. So I replaced the parts in the head and gave her a tuneup. She ran great until the spring broke. After putting her back together I am having new problems. After warmed up the idle is spuratic up and down and when I put it in gear she wants to stall out. When revving up the motor at first touch of the pedal it's sputtering and sounds like its going to die. Like its starving for gas. Some sputtering out of the tailpipe too. But once it's rolling and pedal is past the hesitation point she runs great until I have to stop and then it happens all over again to get her going. Also have a little smoke possibly from the exhaust manifold to pipe gasket. Maybe it was damaged when the head was put on. Any help would be greatly appreciated. And as I said this all happened after the head was fixed. Dirty carb, vacuum leak, timing issue I'm just not sure