Question about Pontiac Trans
Well EST is electronic spark timing. You will check this at the distributor.
Something is wrong with the distributor, not the distributor itself but the timing is off.
If the timing is on then inspect the connections. You may have accidentally bent over a pin.
But in any case the ECM is picking up a fault in the timing.
Posted on Apr 24, 2010
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Posted on Jan 02, 2017
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