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check transmission fluid level,could be very low transmission slipping not going into over drive.if been long time change transmission fluid and filter.if transmission fluid filter already been changed other problems cause transmission not to shift could have worn broken need adjusting.governor valve sticking, governor drive gear worn, governor weights or springs missing or damaged. you could have sticking first and second shift valves.your first and second servos pistons seals stuck or damaged. do fluid change and add some high mileage transmission treatment go to any auto parts stores find transmission additive that will loosen up transmission sticking shift valves in the valve body. if your check engine light is on have vechicle code scan for faulty tps in which will cause transmission not to shift over drive.
sound like problem in the theft security systm,try this insert another key in the ignition switch, the other key could be worn where pcm and bcm dont recognize it. and switch ignition on engine off watch padlock symbol with ignition switch left on 10 minutes the padlock symbol will extinguish or turn off then you will turn off ignition switch wait 5 seconds then try starting vechicle if start your theft security failing need let dealership check it out.
You seem to have covered almost everything electrical. That leaves mechanical. Either valves sticking, frozen, or spring, cam broken. Fuel line or injector to that cylinder is the only other item I can think of. Let me know how it works for you.
the brake light switch is near the brake pedal it should have a wire (or wires) attached to it, it is activated when you push the brake pedal in, they are usually spring loaded & it could be sticking just give it a spray with WD 40 & see if that fixes it, if not it may have to be replaced.........hope this helps.......cheers.
Check for power out of the ignition switch. It sounds like the ignition switch is not engaging on the first try and its taking that second turn to get power from the switch to the ECU and so forth. I would replace the switch and possibly the tumbler if the key comes out while the vehicle is running.
I have a '99 suburban and had the same problem. Couldn't figure it out. Took it to the dealer, and it was a engine disable type module. There is a sensor in the ignition switch that "sees" the key (connected to this module), and allows the engine to start/run. Could be the sensor or the module. My problem was the module. Seem to remember costing about $500 with troubleshooting, parts, labor. Good luck.