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Strange O2 problem

Subi81
in Old Gen.: 80's GL/DL/XT/Loyales...

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OK the other day I was just idleing for an extended amount of time, maybe 10 15 min. As time went on the idle quality would go down till finally it was barley able to run and kinda sputtered, shaking the whole car. At this time I looked at my autometer A/F gauge and it read perfect ratio and didn't tick tock like it normally does while idleing. Reved it and it would kinda tick tock but only a tiny amount. When I went to leave I drove 500 feet and idle came back to normal and so did the normal tick tock on the A/F gauge. Could this mean:

 

A. O2 sensor got to hot

B. O2 sensor got to cold

C. O2 sensor just plain FUBAR'd

D. Something other than the O2 sensor

 

Strange.. the sensor was new when I redid the motor so only 30K on it.

 

Oh this is the 86 turbo wagon in the sig minus the intercooler.

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