RE: 340 DL CVT iregular running at stationair running
Then check the timing. Explosions in the exhaust system are caused by poor timing or even timing out of alignment and can be very dangerous. They may be caused by misfiring or a very coked up cylinder head as well.
Farting in the exhaust when slowing down is a symptom of weak mixture and may be due to main jet in carburettor becoming blocked. I would check and change the fuel filter which may be inside the fuel tank surrounding the fuel pick-up pipe. By "farting" I assume you mean the noise similar to a Morris Minor when slowing on a closed throttle.
All the best, Peter
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