I have a 1995 Mazda Millenia with 175,000 miles. Recently while driving 45-50mph, I have begun to notice the engine surging. Not all the time, but frequently. It is also reflected in the tachometer. Any ideas?
I had the same problem with my 2001 2.5L. Also, it stalled intermittently at a stop. No check engine lights, just the surge and stalling. After searching the forums and talking with a local dealer I changed the distributor and this solved the problem. The Ford Probe also uses the Mazda 2.5L and many sites have postings of these symptoms with advice to replace the distributor.