95 SE - 105,000 miles, car mostly used around town. Engine started to miss, like one cylinder not firing on time. Has good power. I brought to a mechanic for a tune up & was told one injector is bad - but because you need to pull the head - I should do all six.

I used two treatments of fuel injector cleaner in the gas tank & after about 3 weeks the engine ran fine. About 3 weeks later, two tanks of gas without treatment the problem is back. ANYONE HAVE THOUGHTS.