why is it running on 3 cylinders What is your question?
I've changed plugs and wires. but first cylinder is not doing anything
What makes this problem better or worse?
only firing on 3 cylinders
How long has your 1994 Nissan Sentra had this problem?
a few days
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1994 Nissan Sentra Resources
Then > Incorrect cylinder compression - which will require *hands-on* testing.