How to change spark plugs Pontiac Bonneville

First you need to determine what type of miss you have. Is it random on all cylinders, or is it restricted to one or two cylinders? Random misfire can be caused by crank or cam sensors that are starting to give out. Single cylinder misfires can be due to plugs, wires, coils (you already addressed those), as well as internal issues such as burnt or broken valves.

try unplugging mass air flow sensor on air filter duct see if condition improves

check each wire to be at good spark plug number with the image

Double check to make sure you didn't accidentally unplug and censors on the harness. Also check your fuses. for you ignition.

have you replaced the spark plug wire? If so, have the coil checked. Usually it is a bad plug wire that makes it run poorly.

i think your starter moter has gone or your battery is week also your spark plugs might need replacing check all these things

For the 1995 Pontiac Bonneville 3.8L:

Firing Order:
1-6-5-4-3-2
Cylinders:
.......(back).......
|...2....4....6...|
________________
|...1....3....5...|
.......(front)

For the Coils:
(back)
....6
....3
....2
....5
....4
....1
(front)

For this Type Coil (Solid One UNIT):
(back)
_____
|....o| <---6
|O....|
|....o| <---3
|....o| <---2
|O....|
|....o| <---5
|....o| <---4
|O....|
|....o| <---1
(front)

For this Type Coil (3-Section UNITS):
(back)
______
|....o.| <---6
|O.....|
|....o.| <---3
_____
|....o.| <---2
|O.....|
|....o.| <---5
_____
|....o.| <---4
|O.....|
|....o.| <---1
(front)

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

Under the coil pack, there is an ignition module.
Have a look to this link.


https://easyautodiagnostics.com/gm/3.8L/ignition-coil-pack-tests-1

Hope it helps.

The oil pressure sending unit is located behind the oil filter, Threaded into an aluminunm housing. It has wiring that plugs into the sending unit. The oil filter has to be removed and you will need a deep well socket and a 6 inch extension. Change the oil and the sending unit together.

P0300 is a random misfire code, if you are not mechanically inclined the first thing i would do if you havent done so in the past year or more, is change the plugs and wires, a random misfire code can be caused by worn plugs and/or wires not firing properly. let me know if that fixes it.