CEL came on steady, then began flashing for short periods... while flashing car ran very rough and wouldn't accelerate well. Almost acted as though running out of gas. Then in 20 seconds or so would be smooth while light was steady. When checked the diagnostic code was DTC misfire on cylinder 3.
DTC misfire on cylinder 3 on 1997 Pontiac Firebird
by DiggersBunny in San Angelo, TX on November 15, 2012
ANSWER by ziptie12 , November 18, 2012
also check for spark to # 3 as needed and if it has spark check compression? If plug is oil fouled , it may have other internal problem?
ANSWER by pushrod , November 16, 2012
What engine 3.8 or 5.7? The ignition systems are different i think. On the 3.8 6 coils. On the 5.7 distributor system. I think! Could be a bad coil on 3.8 or plug or wire if lntermittent spark. Cold be cap wire or plug on 5.7. Again if spark is the problem.
ANSWER by globalhelper , November 16, 2012
you obviosly have a misfire on #3 and like is flashing to tell u you may damage catt so seek a diag and est or repl # 3 plug and see what happens