I bought probably the last nitro rs4 in stock in the world. This is my first nitro car. I measured the glow plug's volts at 1.4 volts with a voltmeter. (It is charged and works appropriately). The spark plug burns very brightly. No matter how fast I pulled the pull-start, the engine didn't start. I'm pretty sure it's getting fuel to the carburetor. In one of my tries, the engine got hot, I smelled nitro, then yellow fuel flowed from the exhaust, but the engine didn't run. While turning the flywheel, I saw tiny bubbles come out around the glow plug where flywheel hardened, and I heard a bubbling sound—the copper gasket of the plug was in there. Although I tightened it too much, I could not prevent this leakage. Could this be the cause of the engine not running? Can I fix this with a new glow plug? I think engine compression is fine. In all these trials, no matter how much fuel I pumped into the engine, the engine never flooded. Carburetor throttle was around 1.5mm and carburetor needles were at factory settings. Your ideas and helps are very important for me.