Hi, I have a 2001 Taurus, and some days, it just runs like crap. but only for a while. I plugged in my code scanner, and I can watch the timing at idle go from 19 degrees, up to almost 40 degrees, then jump down in the 20's, and back up to the 30's, before top dead center. The car has 220,000 miles. since it has so many miles, early this year I started changing parts that could fail and leave my wife stranded. I changed, crank position sensor, can position sensor, Throttle pos sensor, EGR valve ( it was sticking) and the cam synconizer, Idle air valve. the car runs good most of the time. I did put in a new timing chain , when I changed the water pump at 150,000 miles. and it was a good cloyes true roller, not a cheap one. Thoughts ? I think its the computer.
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