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The check engine light is on still after I replaced both bank 1 & 2 O2 sensors. Is there a bad fuse that is keeping the engine light on?

Yesterday the Service Engine Soon light came on in my 2004 Chevy Blazer. I took it to Goodyear this morning for a diagnostic test and asked them also to change the oil since it has been a long time (since Sept. 09) since I did that. (I know my bad). The tech changed the oil, etc. and told me that the temp sensor was causing the error and I needed a new coolant temp sensor, thermostat & gasket, radiator hoses all replaced, coolant flush, radiator cap and decarb for almost $500. I had to be to work so I made an appointment for tomorrow morning. But as I drove away the light went out. Could it be all I needed was an oil change?  Help please!

88 Bronco, Check engine light comes on and idle varies from 500 to 1500 rpm. frequently stalls acts like it wants to backfire but doesn’t. It happened a year ago but went away but is back. It did mostly through winter went away in spring but came back this spring. Acts like a short?

van starts fine, drive about 10 miles, check engine light comes on. After I shut it off takes forever to start again. have already replaced fuel filter,fuel pump relay, and throttle body sensor. What else can it be? the flash code is 44