Trans and misfire 03 envoy trailblazer

Have you cleaned the throttle body? Seems you have several problems. Blower motor is very common, replace the resistor or control module depending on if you have manual of auto controls( replace the pigtails too, they melt). Door controls, there is a recall on this, call dealer. Gauges could be bad stepper motors on back of guages, which is common.

Yes cleaned throttle body ,vvt solenoid , coils all appear Clean of that or corrosion checked grounds only code k get is a p0300 for random misfire. And the interior stuff not too worries about just wasnt sure if it might be an all together elctricL issue. I Mainly just need the trans and misfire figures out I'm drawing blanks

P0300, could be many things, and could also be contributing to your trans shifting problems by giving the computer faulty info. P0300 is hard to track down, could be your CAT, low fuel pressure, 1 or more bad coils, plugs, (I6 love AC Delco 41-103), intake leak, injector problems. I'd start cheap 1st, remove fuses #10 and #28, replace plugs, make sure the coils click onto the plug, and add some injector cleaner. Measure fuel pressure, and go up from there, like a CAT backpressure test.