2003 Monte Carlo as misfire
 

My car was running good but l decided to do a tuneup and change the spark plugs and wires when I change the wires I did one at the time so I would not mixes the wires up when I started it up it was fine but when I started to drive it started to miss fire and check engine lights came on and was flashing rapidly don't know what to do if anyone can let me know what I did wrong please let me know what I did wrong thanks

If the check engine lights blink don't drive it, did you gap the spark plugs correctly? If I remember they are .060, and what brand spark plug and wires did you use?

Make sure all the plug wires are connected tight at all the plugs and coils.

Thanks guys I'm look in to it but I think I need a new ignition pack