When the air filter is replaced, sometimes the tube between the air filter and the air intake manifold gets torn. If you have an air leak on the tube, it will cause al kinds of jumping and stalling issues. If a tear or hole is noticed, just put some tape over it for a quick check. If that works, replace the tube. Paul
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I would guess you have to go back over your work with regards to the timing chain & cam gear settings If your at a professional shop, they can look at various data, to get an idea if timing is an issue since that work was just done
every once in awhile my mazda will turn iver but wont start.. thier is no reading so my mechanic doesnt know..he said thier was no spark, and then all of a sudden it started he cant get a reading on it..this has happened to me 3 different times it will run for 3 days and then the next time it wont? is thier a sensor? that last 2 times i was driving in slusshy snow and the other day thier was alot of fog..so does it have to do with something getting too much moisture? how can i figure out what the problem is without spending alot of money?
if when running it runs well apart from idle problem i would suggest you have the throttle body and idle speed control valve cleaned out and add a fuel system cleaner to fuel tank also check wireing to idle speed control valve