"Rick Cantellya" wrote in message
news:EdKBc.155973$Ly.76035@attbi_s01...
I have a '98 Pontiac Grand Prix (better known as our Grand Pile). The last
few days it has been hard to start and runs rough when it does. At some
point, it smoothes out and runs fine. I've scanned it and received the
following codes:

P0403 - Multiple Random Cylinder Misfires
P0303 - Misfires on Cylinder 3

Any clues as to the most common cause of these errors? Faulty injector or
coil pack? If so, any clues as to how to zero in on the problem?

Thanks.....


Its spark plug wires and possibly a grounded out plug on cylinder 3
My firebird did the same thing