I have a 2002 Mazda Protege 5 with 115000 miles.
I'll be driving and i can start to feel my car or engine shake so i pull over and slow down and when i get under 15 mph the whole engine starts shaking, the check engine light flashes.
I turn it off for about 3 minutes turn it back on. WORKS FINE!! the check engine light still stays on.
So i took it to autozone they ran the code and it was P0300: cylinder misfires.
They said to change sparkplugs check wires.
I did that changed the spark plugs, they definitley needed to be changed.
Then took it to a mechanic and he said he drove it couldnt find anything mechanical wrong with it and suggested that i have bad fuel.
So i bought some fuel injectors and the problem keeps happening

 

Wayyyyy off-topic.
I'll be moving this post to a new thread.

 

Mmmmm not so sure has he tried to check fuel pressure? it seems more electronic ie Ignition coils breaking down it could be a fuel pump pressure
related fault?