RepairPal Certified shops can diagnose and repair your 1999 Pontiac Grand Am. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
IF YOU HAVE NOT HAD A GOOD TUNE UP MIGHT BE A GOOD TIME FOR ONE. DON'T KNOW WHAT ENGINE YOU HAVE
L4 OR V6 BUT I WOULD REPLACE IGNITION WIRES AND SPARK PLUGS OR SPARK PLUG BOOTS AND SPARK PLUGS.
SCAN TEST SHOULD REVEAL MISFIREING CYLINDER.