2.8 multiport hard to start

'89 Cavalier Z-24 with 2.8 multiport experienced difficulty starting several times last night, but ran fine once it started. Instead of it cranking for one second or less and it firing right off like it normally
does, I had to crank it for 5-10 seconds, several times. The engine was at operating temperature, but this morning when cold it did the same thing. Anyone know what the likely cause for this is? I've had problems in the past with the connector to the crank sensor becoming oil fouled, apparently oil leaches up through the sensor and gets on the connector pins, and they're known to do this, per a TSB from Chevy. I cleaned that connection with electronics cleaner and it seems pretty normal now, although it still seems like it takes somewhat longer to fire up than before. Wondering if I should trust it. Any ideas? TIA
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