Check pcv -recheck carb idle mixture -air/vacuum leaks in carb or lines-double check ur tune up parts
The problem is two things...
1. Air/Fuel mixture
2. Rich/Lean Mixture
Both on the base of the carburetor...they are the two common screwdriver type screws you see at the front of the carb.
You might be running too lean if the engine dies while idling.
How to Lean Out or Richen a Nitro RC
Engine tuning and adjusting the fuel/air mixture involves adjusting the high-end (high speed / engine temperature) and low-end (low speed / idle speed) needles on the carburetor. This is also called dialing in your engine. There are usually base-line settings for each nitro engine that provide a good starting point for adjusting the needle settings. You'll turn each needle in very small increments to lean out or richen the fuel.
Turn clockwise to lean out or add air and counterclockwise to richen or add fuel. The low-end needle controls idling and low speeds. The high-end needle controls how the engine accelerates and runs at high speed and has a greater effect on engine temperature.
Problem: My Motor Hesitates, Backfires, And Won't Hold A Steady Idle.
Solution: Many hot rodders crank up the idle circuit to richen up the air/fuel mixture in this situation, but that's the last thing you want to do. Chances are these symptoms are caused by too much cam and not enough timing. "Big cams and compression don't produce much cylinder pressure at idle, so there's no way a motor will run properly with only 8 degrees of initial timing," says Vrbancic. "You can't expect a performance motor to run well with the same timing as with a stock camshaft. Simply turning the timing up to 15 degrees to compensate for the low vacuum usually fixes the problem entirely."
Check out this link for really good help!
http://www.chevyhiperformance.com/techarticles/0810chp_chevy_carburetor_tuning_tips/index.html
Carb problem or vacuum leak at carb base gasket or intake manifold
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