Hello guys, I drive a Volvo C70 from 2001 with the 2.0t engine 163ps. My gas system is from Prins with the valve protection additive. The gas system has about 200 000km down… the C70 285000km. Now to my problem, sometimes in the stand as soon as the switch to gas go my speeds into the basement and the engine runs very rough and restless. It fights to stay. Has happened already that it did not take more gas, because it only helps to switch to petrol. Later we During the ride it usually works again. The funny thing is that it doesn’t always do that. There are also days when the gas system runs perfectly. If the problems does then always when the engine is warm and I then restart it. What I noticed is sometimes the one in idle when the engine switches on gas runs funny. The car vibrates easily and the engine run does not sound clean either. As soon as I switch on petrol everything is quiet and the engine runs like a 1. It also comes before the one stutters on gas while driving and no more gas takes on. Usually this is only at a speed range below 3000. Switching down a gear helps then always. My workshop, specialized in gas system especially from Prins, doesn’t know any more. They typed first on spark plugs, injectors clogged or filter again. My spark plugs are now new (originally 80€ Volvo) I cleaned the injectors with 2stroke oil (after the Fil) and my filters were changed before 40 000km and before 20 000km again one of the two. GasFilter blue was in the service booklet. Do you have any ideas what could help? Should I change all filters again or could that have something to do with the control unit from the gas system? Would you be really happy if you could help me. MfG Sebastian