I have solved my cyl 1/3 missfire!! It was a bad knock sensor.
Car: 97 OBW, 5MT, 210K miles.
Back during last summer I had an intermittent check engine light. When I read it with my handheld scanner it was defined as the dreaded 1/3 cyl missfire. After resetting it would stay off for a while, typically 6K miles or so. (I typically put about 20K on the car every year.)
During this past winter after resetting the code once again, it started to come back within 60 miles. Eventually it got to the point where the car would studder from 2200rpm to 2800rpm and clear up after that. After reading the postings about the knock sensor issue I replaced mine.
So far it has been 300 miles and all is well. I will keep you all posted of the results.
THANKS FOR ALL THE INFORMATION GUYS!!
BTW, This past weekend I installed new inner tie rods, new outer tie rod ends, and new ball joints on both sides. On the passenger front I installed new front wheel bearings. (I'm lucky as I have access to a hydraulic press ) This car feels like new now!!!
Edited by doc526, 08 March 2011 - 07:03 AM.