My regular (not vw) mechanic installed a rebuilt computer, changed the gaskets, new air filter, oil, oil filter,cleaned the fuel injectors,ignition key electrical component and ignition module, new battery and new fuel pump. Prior to this problem the auto was fine-drove LA to Denver and back without a problem. Had noticed the co2 light had been glowing on the dash but mechanic said that didn't matter. After all his work it still stalls but will start back up right away. Please help. Can't trust to take it on the fwy or far from home!