Missfiring problems with mazda tribute 03 model v6?

I have changed fuel filter, removed fuel injectors for bench check, replaced plugs, metered coils with multimeter, all to no avail this engine misfires and surges under load or cruising and idles rough can hear intermittent miss even on idle.Can anybody give me some more ideas on this engine, the engine fault light does not come on, how is air flow meter checked and o2 sensor checked,if these are faulty does engine fault light come on? Are coils a common fault with this engineMissfiring problems with mazda tribute 03 model v6?have an 01 tribute v6, had rough idle problems but not misfiring under load, engine would misfire until it warmed up. replaced a lot of parts but finally found that the lower intake gaskets were bad. Also when you replaced the spark plugs did you replace the plenum gaskets.
Missfiring problems with mazda tribute 03 model v6?
I had this same problem - the replaced both my upper and lower intake manifold gaskets. Runs great now.

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