Changed spark plugs, car turns over but wont start

SOURCE: Have a 2002 Pontiac Bonneville, turn on ignition car hard to star

it is possible that the starter has a dead spot but before condeming the starter check the connections and make sure they are tight/clean

SOURCE: 1998 Pontiac Bonneville SE 3.8L Backfires/ Sputters

sounds like the ignition module is going bad.

SOURCE: CAR WONT START,OBD SHOWED EGR AND MAF SENSOR

well the egr could be stuck open acting like a vacum leak,,,and causing the car to stall,,,you need a new egr,,,,check the wires and if any vacum hoses that go to it,to make sure they are good and connected first,if so replace the egr,,,,it could be false dtc for MAF sensor,,,

SOURCE: 2000 pontiac bonneville wont start

It sounds like a bad connection somewhere, check the battery cable connections for corrosion and tightness, both ends. It could be the starter, starter solenoid, starter relay, neutral safety switch or ignition. Try moving the shift lever to the "N" position and see if that helps. When you say you have a dead key, do you mean you have no dash lights, (oil pressure light, battery light, things of that nature) no clicking, no nothing?

SOURCE: 1988 firebird formula 5.0 tpi car just died

It sounds like you may have burned out your fusable link. It's a special wire that comes off the starter solennoid and is designed to burn off in the event of an overload. DO NOT REPLACE IT WITH REGULAR WIRE, THIS IS A LEADING CAUSE OF CAR FIRES.
You will want to check for what caused the overload condition that caused the fusable link to burn out in the first place.

Testimonial: "never thought of that great idea ill replace it and let u know thanks alot appreciate your time"