hello i have a 93 mercedes 190e thats driving me nuts,in the morning first start in the driveway when i accelerate to about 3k rpm it boggs but it idle great. when i take off from the light it has good power but then it boggs then stalls also it has a funny smell from under the hood. it stalls while driving if i turn the key on/off 5 are 6 times it will start right up. so i check the fuel pump relay it looks good with no cracks are burn marks so i rule that out. i change the fuel filter and spark plugs also i had the catalytic converter check its good. so i was thinking it was fuel related because turning the key 5 to 6 times to get it back started. could it be the cps are mass air sensor are what else do i check for im lost on this one thank you for you help.