Cylinder #3 misfire

[fastlyfegtp]

Hey guys, I have a 2000 grand Prix gtp 2dr 150,000 miles that has a misfire detected in cylinder #3 and don't know why. When I got the car it had three Ac Delco iridium's in the back and AL p606 in the front three cylinders. I changed the plugs to AC Delco platinum rapid fires and the car started to hesitate and idle real bad and I had to give gas to start. Changed the plugs to AL 606 copper cores and it regained the power back and still has cylinder #3 misfire detected, what could it be?? The car performs like there's no misfire but the code won't go away

[Iceman6669]

Have you had the code reset since you changed plugs?

[blueguy]

Plat. plugs blow.

Get some AL606 coppers.

Gap them at .050". Get new wires and clean the coils as well.

[fastlyfegtp]

Yes I cleared the code

[Iceman6669]

Plat. plugs blow.

Get some AL606 coppers.

Gap them at .050". Get new wires and clean the coils as well.

Hey guys, I have a 2000 grand Prix gtp 2dr 150,000 miles that has a misfire detected in cylinder #3 and don't know why. When I got the car it had three Ac Delco iridium's in the back and AL p606 in the front three cylinders. I changed the plugs to AC Delco platinum rapid fires and the car started to hesitate and idle real bad and I had to give gas to start. Changed the plugs to AL 606 copper cores and it regained the power back and still has cylinder #3 misfire detected, what could it be?? The car performs like there's no misfire but the code won't go away

Well said BlueOne

[fastlyfegtp]

How do I clean the coils?

[Iceman6669]

How do I clean the coils?

use either a wire brush or sand paper and clean off the spots where the plug wires connect.

[fastlyfegtp]

Sanded the coils no change

[Timing]

ITs the plat plugs.... change them

Edit: sry just read you changed them. Make sure you didnt crack the porcelain on the #3. Al are kind of cheap and crack easy. If all else fails do a compression test

[tomtom123]

Might not be a bad idea to get new wires?
Just get stock wires. Don't need anything spectacular

[fastlyfegtp]

I have new Ac Delco wires already, and will do a compression test tomorrow

[Fivefingerdeathpunch]

Swap injectors around too, swap a coil around aswell.

[PurpleGuy]

Coil should be fine. If the coil was bad #6 would have a miss as well. Plug wires is the first
thing id try swapping just to be sure. Then I'd do a comp test to make sure #3 is good. Then I'd try swapping injectors.

[JamesIvey24]

if your worried about the coil, swap it with another one and see if the misfire moves, or stays. ..i ended up replacing the icm under the coils for my misfire on #2 to go away.