Ready to quite before I've started

[dazzlerr6]

I bought a sx3 in January n while putting my electrics in burn some wires so sent it way to be fixed . When got it back a very good friend of mine sorted it out n got it running , so very excited me went to my model club to my first race in 25 years only to be put off coz the car kept cutting out after bout 2/3 mins so my mate spent his race nite swapping bits around to fix it which didn't work so I stripped it all out to start again .but I am to proud to as for help as my mates son is a team driver and is busy so do I quite or keep trying ? I'm running a sp gt pro esc n a sp 6.5 motor if it help .