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Old 10-06-2018, 10:25 AM   #13
Wrenchbender Ret
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Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,190
Re: disconnected trans mod cause engine to run bad ?

It can make it run really bad. The modulator vacuum line is generally hooked to an outlet on the rear of the intake manifold. I vacuum leak in that area will effect #5 & #8 cylinders. It will idle real rough especially with the trans in drive or reverse. It acts like bad valves on those cylinders.
George
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