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Re: 1993 suburban very low idle in gear
Two things come to mind. One is low fuel pressure and the other is weak spark. How long since you replaced the fuel filter? How many miles does it have on it? It could be a weak fuel pump, but I would consider the filter first.
Regarding spark, I had a 95 Chevy truck that the coil was going bad. It would idle down and bog at low speeds. Anything above low speed and it seemed fine. Once I replaced the coil it was amazing how much better it ran.
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