I discovered that the engine control system fuse was blown. (#19) I replaced this and my vehicle seemed fine. Even the CEL was not on. I drove for 5 minutes, about 30 seconds of this being highway speed. Then she abruptly shut down again....but although the same symptoms are showing she has lost all fire again. The fuse is not gone this time. I have replaced the ignition coil but to no avail.
SOURCE: Mazda MPV 2003 Turn Off On The Highway
I had a similar problme to this years ago on a VW that I was driving.
I took it into the the shop and they said that they couldn't find the problem either and couldn't get the car to do it when they tested it.
Then a few weeks later it happened to me again as I was out in the country and an old farmer stopped by to help.
He discovered that the wire leading to the alternator was too thin. It would over heat and then shut the car down. Once it cooled off, it would start up like nothing.
He got a larger piece of wire and and changed it for me right there on the spot. It took about 5 minutes and I was off and running.
I never had the problem again.
I don't know if this is the same thing that you have, but it's worth a look.
Good luck.
SOURCE: Blown main fuse on 2003 mazda protege 5.
There are two bolts on the side of the fuse itself. Under the fuse box on each side. Unbolt those and it will come out.
SOURCE: #5 cylinder misfire
I have a corolla and had #4 cylinder misfire also diagnosed at autozone. After changing the spark plugs, problem persisted, along with the same error code, so they recommended changing the spark plug wires, and that is what fixed it. I would have changed the rotor cap too, but was low on dough. Glad that was not the problem.
SOURCE: how to replace ignition coil mazda mpv 2004
I show $47 for each coil at rockauto.com here is the part #
STANDARD MOTOR PRODUCTS Part # UF406
here is a picture, is this the coil?
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