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Have u done a compression and leak down? I know it's rebuilt but if it's a constant misfire ur a/f will read rich
The gauge in the cluster and ecu uses two different sensors to read coolant temp...having ecu talk and consult would help at this point...plus a noid light at injector would help to see if it's being held open either lead to harness or ecu issue...even if coolant temp was the issue ur motor shouldn't misfire when it think it's cold or hot all the time
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