sick baby :(

[pcb]

So that's the passenger side coil. Just swap it out and see what happens. If it fixes it, you'll have lots of leverage for a no hassle return.
Did you happen to get it from Autozone ??? They appear to sell bad coils.

Don't forget the seafoam,... but do the coil first to you know for sure what has fixed it.

OOOPS,... That's wrong. The passenger side coil sits on top of cylinder #2 and has a wire going to #3 and the driver's side coil sits on top of #4 cylinder and has the long spark plug wire feeding cylinder #1.

That long wire has the most chance of failing due to it's length. It's another part that's hard to test. It too can test fine on the bench but fail on the car.

This guy had a bad plug wire:

http://www.mazdas247.com/forum/showthread.php?123826427-P0301-Cyl-1-Misfire-Problem

 

[MaxPower]

Well I'm heading to O'Reilly to have them run the meter on it then go from there.
This is the one difference from the previous problem: it runs fine for long enough for it to get warmed up, then starts really acting up when I stop at a light or get stuck in traffic. Then it starts acting like an ass.

Given that the problem starts after the engine is warmed up and when bringing the engine back to idle, keep the EGR in mind if the new coils don't fix the problem.

 

[MrsZR7]

A few weeks ago, my P5's engine light came on, and has been running horribly since. It's a manual transmission, and getting started has become really tough. I try to take off, and I can feel the engine shake and it seems like it's going to stall. I push the clutch in, and either give more gas or just shift into 2nd (either method seems to help a little), and then it also lunges with the clutch disengaged and steady on the gas. I've lost about 3-4mpg in fuel economy.

Probably just the effects of that poorly engineered cold air intake you installed. Actually, calling it "engineered" is generous! ;-)

Actually that post was from BEFORE I installed the intake.

 

[MrsZR7]

Well I'm heading to O'Reilly to have them run the meter on it then go from there.
This is the one difference from the previous problem: it runs fine for long enough for it to get warmed up, then starts really acting up when I stop at a light or get stuck in traffic. Then it starts acting like an ass.

Given that the problem starts after the engine is warmed up and when bringing the engine back to idle, keep the EGR in mind if the new coils don't fix the problem.

The problem seems to be fixed now! I drove it from Louisville to Evansville and back yesterday with no problems. Because I'm tight on cash and I was trying to conserve fuel, I drove like a grandma and got 435 miles out of the tank since I replaced the #1 plug and coil pack.

 

[mannydingo]

The problem seems to be fixed now!.....since I replaced the #1 plug and coil pack.

Hi, please let me know where you ordered the part from and, if you can, tell me the brand and model/part number. You never know if I can get it locally here.