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misfires are also from bad injectors , injector harness problems and low fuel pressure
when a misfire is there at start nut clears it is an indication that the injectors need cleaning/ replacing
if it is fuel injected ,have the injectors cleaned. check the fuel pressure as if it is too low then you have to have the throttle setting to wide to get power.
most shops will charge you a minimal amount to put it on a diagnostic test. If you have done the work yourself I would suggest pulling the test plug on your catalytic converter and if that increases power it needs to be replaced. good luck!
If the thermostat is stuck open it would eventually get hot after a while. It's like some people think you can remove the thermostat to keep the engine from getting hot so in theory it could for a little while, however it would eventually overheat. As for the gas mileage being bad yes if it was stuck open and was not warming up fast enough the computer would take longer to go into closed loop, meaning the engine temperature takes to long to heat up so it burns rich until it does warm up enough, however it would be a minor change of mileage say 2 to 3 miles to the gallon. Hope this helps.
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