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Overheating on highway crusing also lean

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paintball4fun21

15+ Year Contributor
168
0
Jun 13, 2006
onalaska, Wisconsin
My car is running lean while crusing only, especially on the highway. It will go from 14's to 15's to 18's then not even register on the wideband gauge and the car will start tugging. No boost leaks. Under WOT the AFR's are fine. Also the car will run a lot hotter while crusing when this happens. It will go from the middle of the temp gauge to in between the top 2 marks(almost overheating) then when I stop and idle or let off the gas the temps will lower. Im thinking o2 sensor? head gasket maybe? I replaced the water pump recently and thermostat
 
anyone? also my compression is 1-170 2-180 3-180 4-180 and I did a leak down test and the results were inconclusive
 
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