K, so what was the steering servo is now the throttle and that servo surges too correct? So that makes two servos surging connected to the same slot on the receiver.

Your receiver will have ch 1, ch 2 and ch 3 slots. Each slot is a channel with a specific control from your transmitter (radio). Find the one that goes to your steering and then the one going to the throttle (leave the brake servo alone). Now reverse those two at the servo. What happens now is the wheel on you radio operates the throttle and the trigger operates the steering (the steering will only go one way). With any luck, the steering servo will now surge and the throttle servo (when turning the wheel) should stabilize.

This will indicate a bad or receiver or radio channel problem. Unfortunately, the only way to distinguish between these two as which is the perpetrator is to try another receiver and/or radio. This is where your buddies stuff comes in handy IF his parts are the same and/or compatible with yours. You don’t want to just swap his receiver with yours and then use his radio too. This won’t help determine your problem. You’ll need a receiver that works with YOUR radio and you’ll also need to use YOUR crystal.

Bad channels in radios are very rare but it’s possible. I’m still leaning toward your receiver.