From the looks of your last video the problem is your tires are not glued! No I'm kidding...Try this put your car on your stand with the radio and reciever on start the car then turn off your reciever on the car, and manually move the throttle linkage towards the brake if car idles down to a managable rpm than you need to adjust your transmitter offset or linkage, now if it just dies than your idle is set wrong and low speed needle may be off as well. Start it again on the stand and turn off the reciever again this time richen the low speed needle, this should bring the rpms down, now check that it will run with brakes on. If it runs with manually applied brakes with high rpms the low speed needle is way to lean or the idle is to high, you will need to turn the low speed needle richer or lower the idle with the idle screw until it idles down to a managable rpm. After you achieve a managable rpm your can fine tune the engine! Now you should let it idle for a little bit before you throttle up on it, let get warmed up or you'll just flood it! Just a note if your low speed needle and idle is wrong you wont get the fuel pull it needs to stay running! It can be tricky to know when to adjust the idle screw or the low speed needle, that is why it is suggested to set your idle at a opening measurement rather than rpm. The rpms can be changed by richening and leaning the low speed needle as well as the idle screw. Turning the low speed needle may adjust the rpm but will change the tuning of the low speed circuit! I do remember when I first got my rc engine having some problems idling. Hope this help and if anybody has any thing to add jump on in!