Hey All of a sudden I’m having a problem. I have a 2000 bmw 540i and when I start the car it idles rough and stalls out. Before I changed the cam shaft position sensors and I’m sure it’s not that. I’m thinking maybe fuel filter, injectors or something with the intake. Any thoughts?

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Techsus
Techsus

Smoke test for vacuum leaks. Check Throttle Body gasket-- is it one of the "thicker" ones that tends to shrink as it ages? If so, replace it. Check intake pipe between MAF & your engine-- has it loosened w/ age? Might need snugged down. While you're in there wouldn't hurt to clean your MAF & Throttle Body. Ensure your MAF is snugged down too. Evaluate MAF -- it might be going bad. Search for DIY on all these at Scotty Kilmer YouTUBE.