1998 Mazda 626

Engine Performance problem
1998 Mazda 626 4 cyl Two Wheel Drive Automatic 149 miles

I recently just had my car a tune up and it seemed to be doin fine but then about 2 weeks into it it started doing the same thing. At stop lights sometimes it hesitates and shakes. And also when im getting on the interstate it takes a while for it to get up to speed and something under the hod sounds like its shaking and shakes the car. And sometimes in sounds like the engine makes a click sound. What could that be from?
September 3, 2008.

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