it runs only 5MPH & hesitates or stops...smells something & hearing some loud noise underneath.What is basically the problem & probably a cost estimate to fix my 03 Mazda MPV with 150K mileage.

What is your question?

I will run 5mph & stop..will give you a bad smell & very loud noise.i am thinking it has something to do with catalytic converter.By the way, how many cat.converters i have to change?

What makes this problem better or worse?

runs only 5mph & stop.Loud noise & smells

How long has your 2003 Mazda MPV had this problem?

1 month