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Did you use a wideband sensor, or the stock sensor?

Seems about right for the stock (narrowband) sensor..


The one on there is a Bosch universal 4 wire. I do not know how to tell the difference. I replaced it a couple years back so I don't have the information on it.

It was an autozone parking lot change and I probably went with the "Cheapest One" knowing me smile



Uh-oh.

You may have just discovered the source of your miss. Apparently the Bosch O2 sensors are shorter than the factory (NGK or NipponDenso) unit, and don't stick far enough into the exhaust stream to get a good reading. A bad reading there would throw the whole mixture off, especially once the engine warms up and goes into open-loop (or closed, I forget which is warm/cold) mode.

Spark plugs are the same story, these motors just don't like the Bosch stuff for whatever reason.

NGK and ND are the factory parts, and not that expensive to replace. If your coil/igniter doesn't solve the problem, I'd look here next.

Good luck

My Truck: 1987 XtraCab DLX 22R 4WD 5 Speed Manual
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"Speed has never killed anyone. Suddenly becoming stationary, that's what gets you." -Jeremy Clarkson