89 Cavalier runs rough at startup


Old 08-29-02, 03:04 AM
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Question 89 Cavalier runs rough at startup

My 89 cavalier, 4 cyclinder, 2.0 runs rough (misses) when engine is first started up. After driving for about 5 minutes it clears up and runs smooth.
This morning I checked the spark plug wires (in the dark) while the motor was running & I could see no sparks but I did see a constant blue light. Does this mean the spark plug wires need to be replaced??
I replaced one of the coils previously and it worked ok up until now.
I took it to a friend mechanic and by the time I got there the symtoms were gone so there was nothing to fix. It's driving me nuts. Someone have any ideas. TIA.
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Old 08-29-02, 03:15 AM
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I inherited this same car from my grandparents....

1) Check the EGR valve, probably needs cleaning or replacement.
2) There has been an update on the PROM which I have and need to install for "cold runaway" problems like this.

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