The car is not that responsive to the transmitter, I changed all the batteries so could the crystals be going bad. I also can't get it to run right like before, it either sounds like its flooding or not enough fuel. I tried adjusting but I have to adjust while I'm running it, longer I run it I have to make adjustments to be able to keep running.
what do you mean by not that responsive? Check and make sure the at the plugs for the servos and batteries are tight in the receiver.
Maybe you have a fuel leak, check the lines, the tank cap, the base of the carb for a leak, make sure your head bolts are tight and your glow plug is good, just because it lights up doesnt mean its good.