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I used an injector cleaner which is poured into the tank a while back and it didn't change anything. Will try it again since there's no harm in doing it. Also did an oil change so the filter was changed. Problem still persists...

Changed to some 5w-30 oil almost a week ago and the problem persists. I've resorted to an online mazda expert to see what he'll suggest. He's recommended checking the plugs but I doubt that's it since the problem only happens on cold starts. Also, there's no rough idle so not sure it'll be...

Changed to some 5w-30 oil almost a week ago and the problem persists. I've resorted to an online mazda expert to see what he'll suggest. He's recommended checking the plugs but I doubt that's it since the problem only happens on cold starts. Also, there's no rough idle so not sure it'll be...

I've been doing some research on engine oil. It seems that 5w-20 (recommended for the 04 Mazda3) gets around the engine faster. On my last service the mechanic suggested 10w-30 so I suspect that the thicker grade may be responsible for the problem (it did start soon after the service). I'm...

I've been doing some research on engine oil. It seems that 5w-20 (recommended for the 04 Mazda3) gets around the engine faster. On my last service the mechanic suggested 10w-30 so I suspect that the thicker grade may be responsible for the problem (it did start soon after the service). I'm...

Hey. I'm having a persistent problem with my '04 Mazda3 where after a cold start (car left off for 6-8 hours or so) it cranks a lot before starting then the engine will shudder badly and sometimes cut out. After that it's fine and the car works with no problem. No CEL or anything. Have any of...

Thanks for the response. The car has 55,000 miles on it. I would agree that it was bad gas since I also had to replace a bad o2 sensor. However, that would have resolved itself by now. No?

Hey all, I'm new here. Alex is the name. I'm having a persistent problem with my '04 Mazda3 where after a cold start (car left off for 6-8 hours or so) it cranks a lot before starting then the engine will shudder badly and sometimes cut out. After that it's fine and the car works with no...