Melissa, P0300 Random Cylinder Misfire, could be caused by bad plug wires,bad /weak coil, Ign. module,clogged bad fuel injectors,etc. will probably have to take it to a good tech to diagnose and est. repair. Check the attached links more info,instruction and guides, Good luck
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How to Diagnose Misfire Codes P0300 P0306 GM 3 8L
Could it be the MAF Please help
P0300 Misfire Detected Code
Can figure out multiple misfire P0300 3800Pro com Forum
How to Diagnose Misfire Codes P0300 P0306 GM 3 8L
Page 1 of 3 Troubleshooting and...
Can figure out multiple misfire P0300 3800Pro com...
ve been getting p0300 code lately...
SOURCE: Blower motor not working
Try replacing the blower motor resistor, it has different resistances for each speed. Mounted on the passenger side air duct, it is kind of a ***** to get to but you can see the harness if you invert and shove your head up into the footwell.
SOURCE: 2002 Pontiac Grand Prix Thermostat
as you face the engine the thermostat bell is on the right (drivers side) Follow the radiatoe hose. Remove the two bolts and raise the bell still attatched to the hose. the thermostat is there with the rubber seal. You can gently pry the thermostat out with a screwdriver or something similar. Put in new thermostat be sure it is the same as the old one, and then replace or change the seal (be sure it is the smae size and thickness as the old one as I got the wrong size from Napa) Then replace the bell, and tighten, but not over tighten. I hope this helps!
SOURCE: LOOKING FOR A FUSE BOX DIAGRAM FOR 2004 PONTIAC GRAND PRIX GT
It's under the hood, on the driver's side, under a square, black box with a lightning symbol on it. Loosen the flower-shaped screw that holds the lid of the box down, remove the lid, flip it upside down and when you look at the inside of the lid, you'll see a map of all your car's fuses. There's also a fuse diagram on the very end of the dash, but it's accessible only when you open the driver's side door. When you're driving, that end of the dash is blocked by the closed door.
SOURCE: p0102 Grand Prix
P0102 is ---- mass or volume air flow circuit, low input.
Check the wires going to the maf sensor and at the connection. If all seems ok, you might need a new sensor, seeing how it ran a little better when disconnected.
SOURCE: location of the radiator drain plug for 2001 Pontiac grand prix
doesnt have one ,remove the bottom hose
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