Like the title says, I think it would be cool to have fully functioning carbs, such as: Pump the gas a couple times to start when the engine is cold. (Runs the accelerator pump to manually spray fuel into the intake) If it has a manual choke, You have to use that when its cold, to start If you dont bump the throttle after a couple minutes to open the choke fully and drop the high idle cam itll slowly climb idle RPM until the throttle is bumped If the engine is forced to run hard before the choke fully opens it bogs, sputters and dies. If the engine is overheating or being run hard, it will vapor lock, causing lean condition, lack of power/stalling If the vehicle does not have an off road carb, and is used on rough bumpy roads or trying to climb a steep hill, the fuel will overflow the bowl and flood it out (Rich condition). When the engine is flooded, when you go to start it, you have to fully depress the throttle to the floor to clear the flood out (Flooded Rich Condition, Results in black smoke out the exhaust when started) If you pump the gas after the vehicle is warm, it would cause a flood condition, subsequently causing a no start and referring back to the previous point Altitude effects the AFM and overall power without being properly tuned Backfire when decelerating HARD backfire if the ignition is cut, while decelerating, pumping the gas then turning the key back on (This is an old timers trick, itll blow weak mufflers right out, a good exhaust system will handle it, but blow a fireball out the exhaust with a backfire that sounds like a gunshot) Have the carb adjustable in the vehicle tuning tab, allowing for different shots from the accelerator pump, different tuning for altitude and engine size etc This game has a lot of cool things built into it and I think its wonderful, but the fact you fit a carb to a certian vehicle in the game and it still performs like a EFI vehicle, its kinda boring and pointless.