2002 buick century spark plugs

You ever change the fuel filter?

Is it throwing any codes ? Could be a vacuum leak causing lean backfire, hesitation and stalling. Run the codes and post them here.

You don't jump a vehicle

You test the battery & if it is good & takes a
charge & holds a charge & is at 12.6 volts or more
you proceed with your testing

do a stall test, like start engine let it run then hold the brake pedal with your other foot raise rpm to put load on engine if you feel the hesitate then it could be spark plugs wire or injectors
hope it helps

Air filter and dirty throttle body.

running rough, could be a few possible things besides spark plugs, and wires!
air filter, fuel filter, fuel injectors, fuel pump, coil pack, Etc.
Id start with the air and fuel filters!
Good luck, Hope this helps!

2002 Buick Century
3.1 liter V-6 VIN "J"

Seems as though you've got it covered...Try adding "SeaFoam" ($9) from Advance Auto Parts and add it to your gas...drive for at least 100mi. Good Luck

Hi there,

You problem is most likely a bad spark plug wire or spark plug. I would start with the wires and then chenge the plugs. Most likely you have a wire shorting out under load.

I had the same problem on my 1999 century and it was cured after replacing the wires. My 1998 Regal GS was running rough and after I replaced the wires it runs great!

Good luck!