gatucar

Hi guys,
My volcano does not work so I need of some experienced advice!
The pipe is broken (I already ordered one) and I have other issues also so I want to start solving them before my new pipe arrives. Can a truck run (just run, I am not talking about best performance) without a pipe?
The engine (was stucked and I oppened and rinsed it with fuel) is finally running but no longer than 4 sec and it stalls. I can not increase the throttle neither since the engine does not rev up. Can this be dirt within the carb? Can this be a damaged engine? Plese send me suggestions.
Thank for your help guys!!
Gatucar