Ignore what people have been "advising" above - there is no reason why a car with brushed electrics and an AM or FM radio can't have it's interference issues solved - the old technology was fine for 30+ years of RC racing...
It's surprising that all of your interchanged gear should offer problems - it could be that multiple components are faulty, it could be that your installation is untidy, or it could be that you are in an environment with a lot of electrical interference (housing and power lines).
The basics are...
- Good condition gear
- Charged batteries
- Don't coil wires and make sure the antenna is the correct length and running out of a long tube (not bundled under the shell)
- Make sure the motors have capacitors fitted
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