Had the same exact problem, friend mechanic said to wait till it was dark and spray some water with a hose under the hood around the plug wires and distributor and then have somebody try and start it and watch under the hood, What a light show!! Seems GM's plug wires are pretty much worthless after 36K, changed the wires with some life time guarantee ones from NAPA and also did a new cap and rotor at the same time and I swear it runs better than when we brought it home new!!
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