Got a 1996 Monte Carlo with a 3.1 engine. Sometimes when starting the engine it is hard to start and when it does it runs real rough. After a few minutes it snaps out of it and runs fine. The check engine like comes on so I took it to AutoZone to check the trouble code. The code that was stored said multiple misfires. I put in new plugs and wires. This improved the performance but it still acts up th same way. It doesn't do this all the time maybe twice a week. Could the coils be causing this problem? Thanks for any help.
Dennis B.