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Mazda Tribute intermittently revving up - catalyst2
Yesterday my wife was driving our Mazda Tribute (3 1/2 yr old, 30 000 miles) and she noticed that, on starting the engine from cold, it revved up rapidly to approx. 3000 rpm a few times, the engine was roaring and revving itself for a good few seconds without the accelerator being touched.
I drove the car today but found nothing wrong. I know very little about cars but I suspect it could be the injection system playing up, I'm thinking sticking valve maybe. Obviously, if it happens again regularly I will need to take it to the Mazda garage.


1) Am I right about sticking valve ?

2) What else can it be ? (is it likely to be serious?)

3) We live 1 mile away from the sea, somebody suggested to us that it could be due to the salt air, is that likely ?

4) Anything SIMPLE we could do to alleviate problem if it happens again ?
Mazda Tribute intermittently revving up - catalyst2
Can anybody help with my questions, any help would be greatly appreicated, thank you.